Carbon atoms can form...
A) one double covalent bond
B) two triple covalent bonds
C) four single covalent bonds
D) three double covalent bonds
Answers
Related Questions
Classification Activity Worksheet Instructions: Read each myth (untruth). Reword it to make a factual statement. Then, give two to three reasons why the myth is untrue. Use complete sentences and support your answer with evidence, using your own words. Myth: A dead organism is the same as a nonliving thing in science. Fact: Evidence: Myth: The Linnaeus system of classification will always stay the same. Fact: Evidence: Myth: Tigers and goldfish are not related. Fact: Evidence: Myth: An organism's kingdom only describes physical characteristics. Fact: Evidence: Myth: Mammals and plants don't belong in the same domain. Fact: Evidence: Your Turn Come up with another myth about the classification of organisms. Then, give two to three reasons why the myth is untrue. Use complete sentences and support your answer with evidence, using your own words. Your myth: Fact: Evidence: I JUST NEED HELP WITH #6
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Answers
Myth: A dead organism is the same as a nonliving thing in science.
Fact: According to science when an organism dies it not different from a non-living thing
Evidence: Non-living things are fundamentally different than living organisms mainly because of the differences in their chemical and biological structures. Living things are made of biomolecules, complex polymers like lipids, proteins, and polysaccharides based on carbon and non-living things are usually made of minerals and other inorganic compounds. So, even if an organism is dead, we can determine that it was a living thing by analyzing its chemical structure.
Myth: The Linnaeus system of classification will always stay the same.
Fact: Carl Linnaeus, a Swedish scientist from the 18th century came up with the perfect classification system that is used up to this day unchanged.
Evidence: Although this system is still widely used to classify living organisms, it has gone through some changes. Linnaeus considered kingdoms to be the utmost level of classification, but biologists today recognize a level above kingdoms, the level of domains. Some scientists also argue that classifying organisms into kingdoms should be abandoned, because not all organisms traditionally divided into kingdoms have the same origin.
Myth: Tigers and goldfish are not related.
Fact: Tiger is a top predator in the jungles of Asia and the goldfish is a small species of fish selectively bred in China and they are not at all related.
Evidence: All living things have the same way of transferring genetic information, trough the DNA molecule. Genetic analyses showed that the last common ancestor (LUCA) of all organisms on Earth has lived 3,5 billion years ago. After that, all living things diverged into separate groups. Tigers and goldfish both are animals and have a common ancestor. Tigers may be in a close relationship with other big cats like lions and cheetahs, but they all have a common ancestor with the goldfish since all vertebrates have a common ancestor that was an ancient fish species.Myth: An organism's kingdom only describes physical characteristics.
Fact: It is commonly believed that organisms are classified into kingdoms only based on their physical characteristics.
Evidence: Before the rise of molecular biology and genetics, this may have been true, but with new scientific methods and techniques, evolutionary relationships and genetic similarities are also taken into consideration when classifying an organism.
Myth: Mammals and plants don't belong in the same domain.
Fact: Mammals, being a group of animals do not belong in the same domain as plants. Evidence: All living organisms are divided into three domains: Bacteria, Archaea and Eukarya. All of the organisms that possess a eukaryotic cell, plants, animals, protists, and fungi are in the Eukarya domain. Therefore, mammals and plants belong to the same domain, the Eukarya domain.
Your myth: Humans are not animals.
Fact: Human beings are not at all related to other species and are completely different than animals.
Evidence: Although humans possess some unique features not found in other species, we are very closely related to apes, and broadly to primates, other mammals, animals, and organisms. The chimpanzee is our closest relative, and we share up to 98% of DNA sequence with them. It is estimated that our common ancestor lived around 6 million years ago.
Answer:
Myth: A dead organism is the same as a nonliving thing in science.Fact: A dead organism actually differentiates from a nonliving one.
Evidence: Nonliving things lack the characteristics of life and will never possess them, according to science. Dead things, unlike nonliving things, lose some of their life characteristics when they die. As a result, comparing the terms "dead" and "nonliving" is incorrect. A book, for example, is not alive, whereas a bug is dead.
2. Myth: The Linnaeus system of classification will always stay the same.
Fact: It will not stay the same, and it will change with time.
Evidence: Since Linnaeus' time, our understanding of the diversity of life has led to the recognition of six kingdoms, instead of the previous three. The Linnaean system, although evolved, is still utilized today to classify organisms. Because we continually find new organisms, there is definitely a chance the system will change.
3. Myth: Tigers and goldfish are not related.
Fact: Tigers and goldfish are related in some way.
Evidence: In the Eukarya domain, Animalia kingdom, and Chordata phylum, there are two organisms that should be considered listed here that are in the lesson, the fish and the cat. The fish has a wide variety of fishes, which could also include the goldfish. The cat also has a relative that should be nicely listed, which is the tiger. That means, because the fish could be counted as goldfish and the cat is a relative to the tiger, tigers and goldfish are technically related.
4. Myth: An organism's kingdom only describes physical characteristics.
Fact: An organism's kingdom truly describes more than just physical characteristics.
Evidence: An organism's kingdom actually describes more than that, narrowing down so they could be specific. For example:
The level of organization (broadest to narrowest):
Domain.Above the kingdom level, the domain is the highest taxonomic rank in the classification system.
Kingdom.A kingdom is the second highest taxonomic level, following domain. Kingdoms are broken down into smaller groupings known as phylum.
Phylum.A phylum is a level of classification or taxonomic rank that is beneath kingdom and yet above class. Phylum is broken down into smaller groupings known as class.
Class.A class is a taxonomic rank that is higher than the order but lower than the phylum. Class is broken down into smaller groupings known as order.
Order.In the taxonomic system, the order is under the class as well as above the family. Order is broken down into smaller groupings known as family.
Family.A family is divided between two parts: order and genus. Family is broken down into smaller groupings known as genus.
Genus.The classification hierarchy is divided between family along with species. Genus is broken down into smaller groupings known as species.
Species.Species is the species with the lowest taxonomic rank and the narrowest unit or classification category.
5. Myth: Mammals and plants don't belong in the same domain.
Fact: Mammals and plants in fact do belong in the same domain in certain instances.
Evidence: In the Eukarya domain, mammals such as insects, fish, jackal and dogs are actually categorized with plants. This is because A domain is the classification system's largest level of arrangement, meaning that this has the most options.
Your TurnCome up with another myth about the classification of organisms. Then, give two to three reasons why the myth is untrue. Use complete sentences and support your answer with evidence, using your own words.
Myth: Rabbits are not at all related to foxes.
Fact: Foxes may pray on ribbits, but they are still nevertheless related.
Evidence: It's almost unbelievable, but the little-known and little-established fact is that ribbits, and foxes are actually very related with each other. Their connection extends beyond the Eukarya domain to the Animalia kingdom, Chordata phylum, and even to the Mammalia class. They may be against each other, but their bloodline isn’t.
Explanation:The previous answer is so wrong it hurts my brain, so I'm stating the actual answers.
Where are you most likely to find plant roots?
O
A. Chorizon
O
B. O horizon
A horizon
O
D. B horizon
Answers
Answer:
The roots of a plant are mostly likely to be found in the top soil the answer is horizon
Plant roots are predominantly found in the A horizon, or topsoil, which is rich in organic material and essential nutrients for plant growth. The correct answer is option (C).
Plant roots are most commonly found in the A horizon of the soil. The A horizon, often referred to as topsoil, is where organic material mixes with inorganic products of weathering, creating a dark-colored layer rich in nutrients. This layer is critical for plant growth as it retains water and has a high concentration of microorganisms which contribute to the nutrient cycle. While the B horizon also supports deep-rooted plants with water and minerals that have leached from the A horizon, it is not as fertile. The C horizon is mostly made up of parent material and lacks significant amounts of organic matter.
Thus, the correct answer to the student's question is option C) A horizon.
Which of the following types of solutions should be used when preparing a wet mount? (Circle one.) a. hypertonic b.hypotonic c.isotonic
Answers
The solution of wet mount should be hypertonic solution.
Explanation:Wet mount is a preparation where the specimen is made to place in a glass slide and a drop of solution is put on the slide. The wet mount is primarily used to see vaginal swab, bacterial slides etc.
Here the wet mount uses a hypertonic solution which is primarily 30 to 40% salt solution in distilled water. The function of this solution is to draw water from the cells and to keep them dehydrated.
The dehydration of the cells maintain their shape, and help to keep any stain if provided. So wet mount uses a hypertonic solution.
A pyramid of energy has 100 units of energy available for the first traffic level. How many units would be available for primary consumers? How did you calculate this?
Answers
2. Membranes are the barriers that separate the inside "living" part of a cell from the outside "non-living"
surroundings. Given that all new materials entering the cell must first cross the membrane, and given
that there is a limit to how much "stuff" can cross a unit area of membrane in a given time, explain how
this might set an upper limit on how big a single cell can be. In composing your answer, describe the
relation between cell size, cell volume, and cell membrane area (see your textbook for a details
discussion). (3 points)
Answers
First i need to know the question so i can help you not the information
Where are the richest deposits of oil and natural gas most likely located?
A.) deep zone
B.) intertidal zone
C.) Continental shelves
Answers
Answer:
The correct option is C) Continental shelves
Explanation:
The continental shelf can be described as a part of a continent which is submerged in shallow water. This shallow water is known as a shelf. Hence, the name continental shelves.
Rich deposits of oil and natural gas can be present in this part of the sea. The continental shelves are of extreme commercial significance and are a commercial site for exploitation. The continental shelves can be rich in metallic and non- metallic ores and hydrocarbon products.
What are the roles of producers consumer, and decomposers in an ecosystem
Answers
Answer:
Producers Create Energy for the Consumers
Consumers "Use" or Consume Things of the environment
Decomposes eat or destroy the dead consumers and producers to help the environment grow
Answer:
thank youu!
Explanation:
How does compact bone differ from spongy bone?
Answers
Image result for How does compact bone differ from spongy bone?
Whereas compact bone tissue forms the outer layer of all bones, spongy bone or cancellous bone forms the inner layer of all bones. Spongy bone tissue does not contain osteons that constitute compact bone tissue. Instead, it consists of trabeculae, which are lamellae that are arranged as rods or plates.
Explanation:
The students would like to communicate their findings to scientists all around the world. Which name should the students use to describe this animal so the scientists all around the world can understand?
Chinchilla rodentia
Lagidium viscacia
Chinchillidae Lagidium
Southern viscacha
Answers
Students should use the scientific name 'Lagidium viscacia' to communicate their findings about the Southern viscacha to scientists worldwide, as it is universally recognized.
The name that students should use to describe an animal so that scientists all around the world can understand is the animal's scientific name. In this case, the scientific name for the Southern viscacha is Lagidium viscacia. This binomial nomenclature is universally recognized and allows scientists from any part of the world to know exactly which species is being referred to, regardless of the local or common name used in different languages or regions. By using the scientific name, students ensure that their communication is clear and that their research can contribute to the global understanding of the species.
You are a doctor in a hospital, and a patient is experiencing trouble with her skin repairing itself from a cut. The patient is also expecting a child, but the cells in the reproduction development are experiencing malfunction in cell division. Describe the stages of each type of cell reproduction process from a normal patient whose body cells can repair themselves and normal cell division during the reproductive development of the unborn baby. Explain the disadvantages and advantages of each type of cell division. Discuss how the patient experiencing problems with the cells repairing from the cut and the child's reproduction development malfunctions can alter haploid and diploid cell development.
Answers
Answer:
Cell divides itself in two ways: Mitosis and Meiosis.
Explanation:
The cell divides itself in two ways:
1. Mitosis: In this type of cell division, the DNA and number of chromosomes of the daughter cell remain same as the parent cell. Mitosis takes place when part of the body gets injured and this process repairs it. It leads to cloning of same types of cells again and again as identical cells are produced. Thus, there is no diversity in this case of cell division.
There are different stages of mitosis:
a. Prophase, in which chromosome starts to condense.
b. Metaphase
c. Anaphase, in which the chromosomes of sister chromatids gets separated and move towards opposite poles.
d. Thus, in the Telophase phase, nuclear membrane re-appear and the cells divide.
2. Meiosis: In this type of cell reproduction, the number of chromosomes of daughter cells and DNA are half than the mother cell. This type is required during sexual reproduction to reduce the number of chromosomes to half. This type of cell division provides diversity in genes. But is a complex process as compared to Mitosis.
Meiosis takes place in two stages and they are:
Meiosis has two stages Meiosis I and Meiosis II.
Meiosis I will form two daughter cells.
a. Prophase I
b. Metaphase I
c. Anaphase I
d. Telophase I
Meiosis II will form four daughter cells with single set or 'haploid' number of chromosomes.
a. Prophase II
b. Metaphase II
c. Anaphase II
d. Telophase II
In the given scenario, if mother is having a problem related to cell division, it is possible that the child would have the same. There could be non-disjunction of chromosomes which lead to improper development of child, physically or mentally.
Cell division has been the process of differentiation of a cell into daughter cells. The cell division has been meiosis and mitosis.
The meiosis has been the division of the nuclear material for the daughter cells, while mitosis has been the same cell formulation without reduction division.
The mitosis has been the division that has been carried out with the injured cell, for the repair. The stages followed in mitosis division are:
Prophase: It has been the first step, where the nuclear material starts condensing for division.Metaphase: It has been marked with the presence of double nuclear material found in the cell with the center alignment.Anaphase: The cells have sister chromatids marked with the opposite movement towards the poles for the segregation and division.Telophase: The chromatids have been found at the poles with the telomere. There has been division of the cell with reappearance of nuclear membrane.Meiosis has been the complex process that has been mediated with the division of the cells in two cells, along half the nuclear material. The division has been found in the reproductive cells.
The stages of cell division in the meiosis have been:
Meiosis I: Prophase I, Metaphase I, Anaphase I, and Telophase I. The division results in 2 daughter cells.Meiosis II: Prophase II, Metaphase II, Anaphase II, and Telophase II. The division has been formation of 4 daughter cells.The mother having problem with the cell division has been resulted in the problem with child as well. The non-dysfunction of chromosomes results in the lack of development.
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How might advancements in genetics and DNA affect an agriscientist’s career?
Answers
Final answer:
Advancements in genetics and genomics are revolutionizing agriscientists' work by allowing for the development of crops with enhanced qualities, such as drought tolerance and pest resistance, thereby improving the quality and quantity of crop yields.
Explanation:
Advancements in genetics and DNA technology have a significant impact on the career of an agriscientist. These advancements, particularly in the area of genomics, can considerably reduce the trials and errors in agricultural research. This has implications for improving the quality and quantity of crop yields through the development of genetically modified organisms (GMOs), by linking specific traits to genes or gene signatures. Agriscientists use genomic data to identify desirable traits and then transfer these traits to other organisms to create hybrids with superior qualities. This can lead to the creation of crops with enhanced characteristics such as increased resilience to drought conditions, resistance to pests, or improved nutritional content.
Furthermore, the application of genomics in agriculture allows for more efficient crop breeding, thereby accelerating the development of varieties with the most desirable features. Scientists are discovering new ways genomics can enhance agricultural production, from creating products that can withstand challenging environmental conditions to increasing the nutritional value of the crops. As such, agriscientists who are skilled in genomics and genetic engineering are crucial for driving innovations in crop improvement, ensuring sustainable agricultural practices, and meeting the food demands of a growing global population.
Which of the following does not cause blood pressure to rise? Growing taller eating animal fats, being young?
Answers
Answer:
Being young
Explanation:
Being young does not cause blood pressure to rise. In contrast, eating animal fats can lead to increased blood pressure due to their high cholesterol content. Growing taller could potentially lead to increased blood pressure, particularly during periods of rapid growth.
Explanation:Out of the options given - growing taller, eating animal fats, and being young - the one that does not cause blood pressure to rise is being young. Typically, blood pressure tends to increase as people age, largely due to factors such as hardening of the arteries, hormonal changes, and lifestyle factors.
Eating animal fats can increase blood pressure due to the high levels of cholesterol and unhealthy fats they contain. Similarly, while growing taller in itself does not cause an increase in blood pressure, rapid growth, for example in puberty, can be associated with a temporary increase in blood pressure.
However, it's important to note that individual blood pressure levels can vary depending on a variety of factors including genetics, physical activity levels, and diet.
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Judging and evaluaing advertisement requires confusing. thinking. because
Answers
Complete Question:
Judging and evaluating advertisements requires critical thinking because _______.
a. advertisements can contain confusing, misleading information
b. all advertisements contain false information
c. advertisers always want to convince consumers to buy unnecessary items
d. truth in advertising laws ensure the accuracy of information in advertisements
Answer:
Judging and evaluating advertisement requires critical thinking because "Advertisements can contain confusing, misleading information".
Explanation:
Advertisements are the sources of information regarding policies, commodities, recruitment, tenders etc. People find it in newspapers, news channels, other television and you tube channels. Relying upon their accuracy depends upon the standard and image advertising channel have in market.
Sometimes confusion arise being human and find irrelevant or illogical content of advertisement, which can mislead or increase complexity for customers and portray poor image of advertising agencies. Therefore, in the era of huge availability of advertising sources, the information is needed to picked up from appropriate sources by judging and evaluating properly.
In organisms blank are encoded in segments of its Chromosomes called blank
Answers
Answer:
Traits, genes
Explanation:
Answer: Chromosomes are made of DNA and proteins . chromosomes called genes.
Explanation:
If you wanted to repeat your experiment, you could do it once, then do it again, and so on. You could also _____.
A. complete more than one trial at once
B. pick a procedure that takes less time to complete
C. ask another group of scientists to do the same experiment
D. copy your results several times and change the numbers a bit
l trial
Answers
If you wanted to repeat your experiment , you could do it once, then do it again, and so on. You could also pick a procedure that takes less time to complete.
Explanation:
When a scientist is doing an experiment for a repeated number of time then various things can be evolved through the experiments, they are , so that the results of the experiments are verified, various skills can be developed through repeated experiment. Repeated experiments help to enhance the accuracy as well as it reduces the error. It also improves the reliability. If the experiment is taking huge time then the scientist can adopt any other procedure that takes less time.
WORTH 10 POINTS! Please Help me!
1. Do you think Tampa will clear within the next 12 hours? Explain your answer. 2 points
2. What type of weather is in store for Miami within the next 12 hours? Explain your answer. 2 points
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Answer:
There will be more clouds and most likely a storm because the barometric pressure is falling.
The tutor can't predict the weather as it requires real-time data analysis by a meteorologist. However, websites and apps like The Weather Channel or National Weather Service can provide accurate forecasts.
Explanation:As a tutor on Brainly, I am unable to directly predict the weather as I am not a meteorologist and this platform is not real-time. However, I can guide you on how to find this information. Websites like The Weather Channel or National Weather Service, and many smartphone apps can provide up-to-date and accurate weather forecasts for both Tampa and Miami within the next 12 hours or more.
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Since photosynthesis is a metabolic pathway plants use for transforming sunlight energy into carbohydrates, what is lost during the energy transformation process
Answers
Answer:
when photosynthesis occurs oxygen is lost
What is the order of these for geology?
Answers
Answer:
The correct sequence is 2,3 and finally 1.
Explanation:
Proper order of the given passage is:
From scientific evidence, the early atmosphere about 3.5-3.8 billion years ago was the mixture of gases CO2, CO, N2, H2, NH3, CH4.Organisms performing photosynthesis(aerobes) released free oxygen as waste product. This oxygen was poisonous to the anaerobes and anaerobes declined.As the oxygen in the air increased, aerobes became dominated and anaerobes were forced to live in the dark.To what organs does the systemic circulatory system NOT supply blood?
Answers
Answer:
It supplies blood to all the organs
Explanation:
The circulatory system is responsible for the circulation of blood and receiving the blood is necessary for all the essential organs. So, the circulatory system supplies blood to all organs.
Which sentence best explains the ideas of the comm with respect to human population growth? A. Each birth adds another person to the population
Answers
Complete Question:
Which sentence best explains the idea of the tragedy of the commons with respect to human population growth?
A. Each person overuses air, water, land, and food resources.
B. Each birth adds another person to the population.
C. People have more in common than they realize.
D. People cannot help but be guided by the interests of the group.
Answer:
"Each person overuses air, water, land, and food resources" best explains the ideas of the tragedy of the commons with respect to human population growth.
Explanation:
In short, human rationality and collective rationality are at odds with each other and inconsistent within the tragedy of the commons. In the foreground, Hardin characterizes the population problem as a Commons tragedy since the Earth is finite and therefore can not continue to cater the growing human population.
A service must be scarce, rival in use, and non-exclusive for a Commons catastrophe to occur. Alternatives to commons catastrophe include enforcing individual liberties, controlling policy, or creating a collective action system.
Final answer:
Population growth is affected by births, deaths, and migration, not just new births. Some countries do have negative growth rates, and the current global population is around 7 billion, reached between 2011 and 2012.
Explanation:
No, new births are not solely responsible for the increase in population size. Population growth is influenced by several factors, including fertility, mortality, and migration. Other types of data that would help determine the reasons for this increase in population size include death rates, migration statistics, and age demographics, which provide insight into the mortality and movement patterns that also affect population dynamics. True or False. Some countries have a negative growth rate. This statement is true, as some countries experience population decline due to various factors such as low birth rates and high emigration. The current population of the Earth is around 7 billion. It was between 2011 and 2012 that we reached this milestone, demonstrating an exponential increase from previous billions and the ongoing trend towards higher global population numbers.
6. What are proglottids? What is the scolex?
Answers
Explanation:
Proglottids are segments in cestodes that contain bot the male and female reproductive organs. These segments go ahead to make eggs and then dettach form the worm. They are excreted and become agents of infection on the next hoist. Proglittids formed near the neck of the worm are immature while those at the tail end are literally bags of mature eggs.
The scolex is the head of the worm that is attached to the host. It is also the part that ‘sucks’ nutrients from the host. It has hooks that it uses to anchor itself in the host. In some species, rather than hooks, there are suction-cups that use suction for anchorage.
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Zooplankton get their energy from
phytoplankton
grasses
photosynthesis
small fish
Answers
Answer:
Zooplankton -tiny aquatic habitat organisms- gets their energy from phytoplankton consumption.
Explanation:
Zooplankton, or animal plankton, is characterized by being heterophosphoric organisms, obtaining its energy by consuming organic matter.
The main food source of zooplankton is phytoplankton, although they can also feed on organic waste, from the same zooplankton or even bacteria.
Zooplankton is composed of a very small fauna that includes single-cell organisms -such as protozoa and protists- fingerlings, larval forms of mollusks, crustaceans and aquatic arthropods.
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Which equation best represents the process of photosynthesis
Answers
the following is an example of an indirect observation?
A.
using tools such as a thermometer or rain gauge to take measurements
B.
counting rings on a tree stump to determine its age
C.
counting the number of bald eagles that land near a river
D.
using a live video to observe nesting owls
Answers
What was first responsible for changing the formerly poisonous atmosphere to an oxygen-rich atmosphere, as we have today?
Answers
Answer:
"Photosynethic bacteria (Cyanobacteria)" was first responsible for changing the formerly poisonous atmosphere to an oxygen-rich atmosphere, as we have today
Explanation:
The cyanobacteria are photosynthetic bacteria that are oxygenic. They extract energy from the sun, take up carbon dioxide and release oxygen. Unlike plants and algae, cyanobacteria comprise chlorophyll, and by carbon fixation transform carbon dioxide into sugar.
Cyanobacteria are prokaryotic species, unlike eukaryotic plants and algae. A phylum composed of free-living bacteria and endosymbiotic plastids (a Gloeomargarita sister group found in certain eukaryotes) is called as Cyanophyta or Cyanobacteria. These also contain multiple yellowish carotenoids, the blue phycobilin pigment and, in certain organisms, the red phycoerythrin pigment.
Evaluate several popular movies and books involve mutated organisms. Are these transgenic organisms a possibility why or why not?
Answers
Movies like GMO OMG, species and X-men usually involves mutated organisms as their main subject. These transgenic organisms can possibly be created but certain of their species is banned considering the controversy that will create.
Explanation:
Mutated organisms are nothing but genetically modified organisms that will be developed by altering or modifying the genome of plants and animals through some breeding techniques that are followed traditionally for many number of years.They involve artificially selecting specific traits which results in the formation of a new organism.This concept is well used and explained in many of the movies, books etc.They are some possible in the modern world and an example for scientifically created mutated organism is the hairless cat.Though they are possible practically,they are not often preferred considering the controversy and risk such as Reducing the metabolism of the actual organism and their growth rate. Thus they are possible but are not preferred.Ann has a business mowing lawns
in her neighborhood. On Mondays
she makes $18, on Tuesdays she
makes $25, and on Thursdays she
makes $19. If Ann makes this
much money every week, how
much will she have made in 3 weeks
Answers
Which was the original source of atmospheric oxygen? Question 4 options: autotrophs cooling of Earth’s crust formation of the oceans volcanoes
Answers
Final answer:
The original source of atmospheric oxygen on Earth was autotrophs, specifically cyanobacteria, which produced oxygen as a by-product of photosynthesis over 2 billion years ago, leading to the development of more complex life forms.
Explanation:
The original source of atmospheric oxygen on Earth was autotrophs. More specifically, it was cyanobacteria -- early phototrophic organisms that evolved the capability for photosynthesis. Photosynthesis uses solar energy to convert carbon dioxide and water into glucose and, importantly, oxygen as a by-product. Cyanobacteria began to significantly contribute to the oxygenation of the atmosphere over 2 billion years ago. This process eventually gave rise to more complex life forms by increasing the oxygen content in the atmosphere and created an ozone layer that protected emerging life from harmful ultraviolet radiation.
While volcanic activity also played a role in shaping the early atmosphere by releasing various gases, it didn't contribute to the oxygenation of the atmosphere until later, when plant life became more widespread, and photosynthetic activity increased oxygen production.
3. What material does the nucleus contain? What is the purpose of this material? The nucleus contains "the cell's genetic material, DNA." DNA makes protein molecules to help with almost every cellular process.
Answers
Answer:
The nucleus contains "the cell's genetic material, DNA." DNA makes protein molecules to help with almost every cellular process
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the process of clearly identifying how a variable is measured is referred to as
Answers
Answer:
Operational DefinitionExplanation:
the process of clearly identifying how a variable is measured is referred to as Operational Definition
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