1) Mesozoic
2) Cenozoic
3) Paleozoic
2020 on edge
Chemical weathering ___.
A) is caused by freezing and thawing
B) breaks apart rocks by physical processes
C) occurs when chemical reactions dissolve or change the minerals in rocks
D) none of the above
Answer:
C
Explanation:
When Chemical Weathering occurs the rain water reacted with the mineral grains in rocks by forming new minerals, called clays and forming as well, soluble salts.
The answer is C. because the erosion or disintegration of rock, building materials, cause by chemical reactions(chiefly with water and substance dissolved in it) rather than by mechanical processes.
What cell don't have any membrane bound organelles but they do have a nucleus
A. Dna
B. Prokaryotic
C. Nucleus
Answer:
Dna
Explanation:
The nucleus is surrounded by a membrane. Prokaryotic cells do not have a nucleus
Prokaryotic cell don't have any membrane bound organelles but they do have a nucleus. Thus, the correct option is B.
What is prokaryotic cell?Prokaryotic cells are defined as the cell which single-celled, non bound organelle microorganisms known to be the earliest on earth. Prokaryotes comprises bacteria and archaea.
The photosynthetic prokaryotes comprises cyanobacteria that perform photosynthesis. A prokaryotic cell comprises of a single membrane and hence, all the reactions occur within the cytoplasm. The below diagram shows a prokaryotic cell.
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PLEASE HELP!!! :)
Julia demonstrated the formation of a type of rock. She mixed egg, salt, and herbs and cooked the mixture over a flame. The egg turned into an omelet. The formation of which type of rock did Julia demonstrate?
A.) Eroded rock
B.) Igneous rock
C.) Metamorphic rock
D.) Sedimentary rock
Answer: Option (C)
Explanation: Metamorphic rocks are those rocks that are formed when a pre-existing rock undergoes changes or metamorphism, due to the changing pressure and the temperature condition, and forms a new rock. For example, Quartzite, Marble, Schist and Gneiss. They are also known as the secondary rocks, as they are derived from the previous rock.
In the given condition, Julia mixes the egg with salt and herbs and cooked the mixture over a flame, this is compared to the changing pressure and temperature condition that rock undergoes, and that lead to the formation of her omelette, which is here compared to a metamorphic rock.
Thus, the correct answer is option (C).
Its C, just answering so the other guy can get brainliest <3
IM GIVING 25 POINTS AND 5 STAR RATING AND THANKS TO WHOEVER AN ANSWER IS LESS THAN 20 MINUTES PLEASE HELP!!!!!!
Sickle cell anemia is known to run in a family. A pedigree chart for this family is shown below. The parents are shown at the top and from left to right appear as a half-shaded circle next to a half-shaded square. The two are connected by a straight line. Below the parent pair is a vertical straight line connecting to the next row of circles and squares which are the offspring. Starting from left an unshaded square, half-shaded circle, another half-shaded circle, and a completely shaded square are shown. All of these are also connected by a horizontal straight line.
What percentage of the offspring are carriers of the disease but do not have it? (4 points)
0%
25%
50%
100%
Answer:
b
Explanation:
Answer:
25%
Explanation:
why does fossil fuel use in the United States make the u.s. vunerable to the political wishes of foreign countries?
a. the US is a net exporter of fossil fuels
b. fossil fuels lead to global climate change
c. the US imports much of it's petroleum from foreign countries which set the prices
d. all of the above
Answer:
Option A ,the US is a net exporter of fossil fuels
Explanation:
In the recent time, the prices of fossil fuels (i.e crude) oil fell very low due to which the prices of processed petroleum products such as petrol, diesel, etc reduced to the a very low value in last 30 years. This all happened because new oil reserves have been explored in US due to which the the price of crude oil has dropped globally.
In developing countries like India, price of petrol and diesel is one of the political agenda.
Thus, fossil fuel use in the United States make the u.s. vunerable to the political wishes of foreign countries
Option A is correct
U.S. vulnerability due to fossil fuel reliance is linked to the fact that it imports much of its petroleum, making it subject to foreign pricing and political pressures (option c).
The reliance of the United States on fossil fuel imports makes the nation vulnerable to the political whims of foreign countries primarily because the U.S. imports a substantial portion of its petroleum from these countries. This dependence on foreign oil means that the US is susceptible to fluctuations in fuel prices, determined by the exporting countries or global markets (option c). Additionally, the geopolitics surrounding fossil fuels can compel the United States to engage in foreign policies or military actions to secure energy resources, influencing its political and economic decisions.
Historically, the United States has developed policies to reduce reliance on Middle Eastern oil by diversifying its sources, turning to countries like Canada, Mexico, Venezuela, and Nigeria. The presence of oil reserves within a nation can have a massive economic impact, providing jobs and dividends to investors, influencing global geopolitics, and sometimes leading to power imbalances and conflicts over resources.
Which of the following types of nonrenewable fuel sources requires the storage of radioactive waste?
A. Coal
B. Oil
C. Solar
D. Nuclear
Answer: D. nuclear
Explanation:
Nuclear types of nonrenewable fuel sources requires the storage of radioactive waste, hence option D is correct.
Uranium is a nonrenewable energy source that may be used to divide its atoms into heat and eventually electricity through a process known as nuclear fission.
The element uranium is the one that is most frequently employed in nuclear power reactors. Nuclear power plants typically employ U-235, a highly uncommon form of uranium.
A non-renewable resource is uranium. Around the world, generating power via nuclear energy is a common practice.
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Area measuring 5 m² contains 50 earthworms what is the population density of the earth worms
The density of a population of living organisms is usually measured in individuals on one square km. In here we have 50 earthworms on an area of 5 square meters, thus we have 10 earthworms on every square meter. In order to get to the result we need to see first how many square meters there are in one square km. One square km has one thousand meters of length and one thousand meters of width so:
1,000 x 1,000 = 1,000,000 km²
Since we established that we have 10 earthworms on every one square meter, we just need to multiply the number of square meters with the amount of earthworms on every square meter:
1,000,000 x 10 = 10,000,000
So we have a density of 10 million earthworms per square km.
what gets wetter & wetter the more it dries?
Answer:
A towel
Explanation:
towel or napkin
____________
What is plant respiration in simple terms? (Cellular respiration)
Answer:
Cellular respiration is the process of breaking sugar down into a form that the cell can utilize as energy.
Explanation:
This happens in all types of life. Cellular respiration takes in food and uses it to produce ATP, a chemical which the cell uses for energy. Typically, this process uses oxygen and is known as aerobic respiration.
I hope this was helpful!
The sequence of ________________ in a DNA molecule determines the protein that will be produced. A) lipids B) nucleotides C) proteins D) sugars
B) Nucleotides
Hope this helps and have a great day :)
The answer is B good day :)
In normal humans, sex cells contain the _________ number of chromosomes.
Final answer:
Normal human sex cells contain a haploid number of 23 chromosomes, differing from somatic cells which have a diploid number of 46, divided into 23 pairs.
Explanation:
In normal humans, sex cells contain the haploid number of chromosomes. This means that each sex cell, or gamete, carries a single set of 23 chromosomes, one of which is a sex chromosome. In contrast, the somatic cells of humans (any cell of the body except sperm or egg cells) contain a diploid set, which amounts to 46 chromosomes, making up 23 pairs.
During the process of meiosis, the chromosome number is halved from the diploid to the haploid state to ensure that upon fertilization, the resulting offspring will have the correct diploid number. A normal human karyotype illustrates this balance, showing 22 pairs of autosomes and one pair of sex chromosomes: two X chromosomes in females, and one X and one Y chromosome in males.
Describe why an enzyme is specific.
Answer:Enzymes are highly selective catalysts, meaning that each enzyme only speeds up a specific reaction. ... The molecules that an enzyme works with are called substrates. The substrates bind to a region on the enzyme called the active site. There are two theories explaining the enzyme-substrate interaction.
Explanation:
.
An enzyme has a specific shape for the substrate it’s meant to break down; it only fits that substrate to break it down into the final product. Ex. Lactase (Enzyme breaks down Lactose (substrate) into Glucose and Galactose.
Station 1! Help pls!
1. Which of the following groups has the largest number of different organisms?
A. Family
B. Class
C. Kingdom
D. Domain
2. Which of the following is not one of the three domains?
A. Archaea
B. Phylum
C. Eukarya
D. Bacteria
3. Which of the following groups contain organisms that are most closely related?
A. Species
B. Class
C. Genus
D. Order
4. Organisms are called by their scientific name, which consists of their ____ and ____.
A. Genus; Species
B. Order; Family
C. Class; Family
D. Species; Kingdom
Answer:
1. D
2. B
3. A
4. A
Final answer:
The D. domain contains the largest diversity of organisms, B. Phylum is not a domain, species are the most closely related organisms, and the scientific name of an organism consists of its A. Genus and Species.
Explanation:
In biological classification, the hierarchy of categories from most inclusive to most specific is: domain, kingdom, phylum, class, order, family, genus, and species. The answers to the questions presented are as follows:
Domain is the classification group with the largest number of different organisms.Phylum is not one of the three domains; the three domains are Bacteria, Archaea, and Eukarya.The group that contains organisms that are most closely related is Species.Organisms are called by their scientific name, which consists of their Genus and Species.The binomial nomenclature is the system of nomenclature in which each species is given a unique name that consists of two parts, the generic name (genus) and the specific name (species).
Which feature forms at a divergent boundary? rift valley island arc subduction zone collision zone
Rift valley is the feature forms at a divergent boundary,A divergent plate boundary often forms a mountain chain known as a ridge.
What is Rift valley?A rift valley is a linear shaped lowland between several highlands or mountain ranges created by the action of a geologic rift. Rifts are formed as a result of the pulling apart of the lithosphere due to extensional tectonics. The linear depression may subsequently be further deepened by the forces of erosion.Rift valley is the feature forms at a divergent boundary,A divergent plate boundary often forms a mountain chain known as a ridge.
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Plants absorb nitrogen in the form of nitrate ions and ___ ions
Answer:
ammonium
Explanation:
Plants absorb nitrogen in the form of nitrate ions and ammonium(NH4^+) ions.
Someone pls help!
The picture below shows warm air over land and cool air over water.
Air currents form due to the uneven heating of Earth. According to the picture above, what direction will the air currents most likely move?
A. straight down over the land
B. straight up above the water
C. from the water toward the land
D. from the land toward the water
Answer:
I think it is D
Explanation:
Driven by convection, the air currents will most likely move from the land towards the water as the warm air over the heated land rises and the cool air over water descends.
Explanation:Based on your question, the air currents will most likely move from the land toward the water. This movement is driven by convection, a process by which heat is transferred within fluids. When the land is heated by the Sun, the air above it also gets warm. This warm air is less dense, which causes it to rise. Meanwhile, the cool air above the water which is denser descends creating a pressure difference. To equalize this pressure difference, the warm air above the land moves towards the cool air above the water, contributing to the air currents.
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A company wants to start a nuclear power plant as a way to produce clean energy. They want to use the same reaction that's used in thermonuclear weapons. Which of the following explains why this is not possible?
A. The energy in nuclear fission produces chemicals that harm the environment.
B. The energy in nuclear fusion can't be generated in a controlled manner.
C. The energy in nuclear fusion is too small to generate electricity.
D. The energy in nuclear fission burns out as soon as it's produced.
Please don't guess, try to give the right answer
Hey! I took the Penn foster exam, and i answered (a). I got it wrong, so I tried to find the correct answer. I’m pretty sure the answer is (b), and here’s some text from the Penn foster lesson.
“Unfortunately, nuclear fusion can't be used in nuclear power plants as the energy required to start a fusion is very large. The energy required to start a fusion reaction cannot be generated in a controlled manner.”
Anyways, hope this helps:) If this is wrong, please comment and tell me the correct answer.
explain why water logged soils are usually deficient in nitrates
Low levels of oxygen in/by the root zone causes soil & plants to turn deficient and die .
another reason is because anaerobic microbes that have gotten waterlogged create a toxic/bad waste that harms its surrounding living plants.
Which do scientists link to increase hurricane strength
Scientists link increased hurricane strength with the help of both multi-natural cycles as well as warm ocean water from global warming.
What is global warming?Global warming is defined as the long-term warming of the planet's overall temperature. Though this global warming trend has been going on for a long time, it has significantly raised in the last hundred years due to the burning of fossil fuels. As the human population has increased in large amounts, so has the volume of fossil fuels burned.It is caused by raised concentrations of greenhouse gases in the atmosphere, mainly from human works such as burning fossil fuels, and farming.Overall, glaciers are melting at a faster rate with temperature. Sea ice in the Arctic Ocean around the North Pole is melting faster with the cold temperatures.To learn more about global warming refer to:
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The jones family gas had their dog, Sadie since she was a puppy. Sadie was raised in the home, which has a letter carrier visit at the same time ever day. Though Sadie used to bark and scratch the door when the letter carrier deopped off packages, now she doesnt even wake up from her nap when the letter carrier comes. Sadie is demonstrating a learned behavior that she acquired through what method?
a) habituation
b) trial and error
c) imprinting
d) mimicry
please help?
a) due to a learned behavior so habituation
Answer:
a) habituation
Explanation:
Habituation is the adaptive learning behaviour in which the response strength is reduced when stimulus is given repeatedly. Barking and scratching of door by the dog was the response towards arrival of letter carrier. However, repeated visits of the person at the same time reduced the strength of response through the process of habituation.
Which characteristics do photosynthesis and
cellular respiration have in common?
Check all that apply.
Photosynthesis and cellular respiration both involve the metabolic pathway of carbohydrates, use electron transport chains for energy capture, and are part of a biological cycle linking the two with the exchange of oxygen, glucose, carbon dioxide, and water.
The characteristics that photosynthesis and cellular respiration have in common include:
Both processes involve the metabolic pathway of carbohydrates to produce energy, with photosynthesis building carbohydrates and cellular respiration breaking them down.
They both utilize an electron transport chain to capture energy necessary for other reactions.
These processes form a cycle where photosynthesis produces oxygen and glucose needed for cellular respiration, while cellular respiration generates carbon dioxide and water, which are inputs for photosynthesis.
Additionally, while photosynthesis occurs in the chloroplasts of plant cells, cellular respiration takes place in the mitochondria of all eukaryotic cells, illustrating that both rely on specialized cell organelles to occur.
5)
All the plants grown from a given type of genetically engineered seed are genetically identical. On the one had, uniformity can make it easier for a farmer to manage the crops. Which is the best reason why the loss of genetic variation is an environmental concern?
Hi!
If there isn't genetic variation, every identical copy of the organism has the same immunity to a disease. If a disease that they don't have immunity to comes, they will all die.
Hope this helps!
how would you use red, blue, and yellow marbles to model a carbon atom
I attached a picture showing how to do it
Answer:
The correct answer is - arrange yellow and blue in the center as proton and neutron while red as electrons revolving in a different shell.
Explanation:
The carbon atom has 6 protons and 6 neutrons present in the nucleus of the atom while 6 electrons present in the shell. The inner shell has two and the outer most shell has 4 electrons.
One can represent all three color balls as an electron, proton, and neutron to model the carbon atom.
What type of blood disorder can be caused by an infection?
hemophilia
sepsis
anemia
lymphoma
Possibly try anemia Many other acute infections, either viral or bacterial can cause anemia
Your answer should be sepsis
How does the process of gel electrophoresis separate DNA fragments?
DNA is negatively charged due to its phosphate groups. Gel electrophoresis has one side that is positive and other that is negative. Once dna fragments are placed inside. The bigger fragments will move towards the positive side since positive is attracted to negative.
Answer:
For the separation of DNA fragments we use gel electrophoresis.
Explanation:
Since DNA fragments are negatively charged molecules they can be separated by forcing them to move towards the positive electrode anode under an electric field through a medium or matrix. The most common matrix is agarose. The DNA fragments separate according to their size through sieving effect provided by the agarose gel. Hence, the smaller the fragment size, the farther it moves. The separated DNA fragments can be visualized only after staining the DNA with a compound known as ethidium bromide followed by exposure to UV radiations. You can see the bright orange colored bands of DNA in a ethidium bromide stained gel exposed to UV light.
what are the advantages of classifying species according to their evolutionary relationships, instead of their physical similarities
Final answer:
Classifying species by evolutionary relationships provides a more accurate reflection of their shared ancestry and genetic heritage, which is essential for understanding the consequences of evolution and for updating classifications with new scientific data.
Explanation:
The advantages of classifying species according to their evolutionary relationships, rather than solely on physical similarities, are numerous. One key advantage is the ability to reflect the species' shared ancestry and evolutionary past. This phylogenetic classification offers a more accurate depiction of how species are related to one another and provides context for their physical and genetic traits. While physical traits can be misleading due to convergent evolution, where unrelated species independently evolve similar features, phylogenetic relationships are based on the genetic heritage that organisms share due to descent from a common ancestor.
prairie dogs are rodents that eat nonwoody plants and live in burrows in the expanse of the prairie biome. in which of these other biomes would an animal with similar adaptions live: taiga, tropical rain forest, tundra, or deciduous forest? explain your answer
Answer:
tundra
Explanation:
The tundra is a biome in which there are no large trees, and the ones that are present are small as a typical grass. The majority of the plants are nonwoody ones. The climate is very cold throughout most of the year, so the animals that are able to make borrows are using them for the majority of the year, as it is much warmer below the ground than on the surface. If we take the way of lifestyle the prairie dog has and what it requires, then it will not be weird if an animal with very similar characteristics is found living in the tundra. The basic conditions seem to very similar, so an animal that is prairie dog-like, will only need slight adaptations in order to survive in that environment, mostly thicker fur, and ability to have a long hibernation.
what are the main functions of the liver in a jaguar
Answer: performs most metabolic functions of the body
Explanation:
1.it produces proteins with the help of vitamin and therefore helps in blood clotting
2.it breaks down old and damaged blood cells
3.it causes break down of fats and produces energy which is utilized by the body hence it helps in fat metabolism
4.it produces bile and causes excretion of bilirubin ,cholesterol,hormones and drugs.
5.it metabolises proteins and carbohydrates
Which is a characteristic of pseudoscience
Pseudoscience is characterized by the lack of scientific evidence and reliance on anecdotal or subjective experiences. It lacks the rigor and methodology of a scientific investigation.
Explanation:Lack of scientific support and dependence on anecdotal or subjective experiences are traits of pseudoscience. Let's take the example of someone claiming to have created a medication that will cause you to lose weight without the need for exercise or dietary modifications.
It would be regarded as pseudoscience if there was no scientific study or evidence to back up this assertion and it was only based on the testimonies of a small number of people. Pseudoscience frequently lacks the methodological rigor of a scientific inquiry, making it impossible to verify or duplicate its conclusions.
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Pseudoscience is presented as scientific but does not follow scientific standards and cannot be tested or falsified. An example of pseudoscience is astrology, which lacks experimental backing.
In contrast, legitimate scientific disciplines, such as astronomy, rely on testable and falsifiable theories.
Circle All words that correctly apply to/describe hemoglobin:
(A.) protein
(B.) carbohydrate
(C.) composed of amino acid
(D.) chemical molecules
(E.) composed of DNA.
(F.) composed of RNA
(G.) carries O2 through the bloodstream
Hemoglobin, found in red blood cells, is a protein made up of four subunits and heme groups that bind oxygen, allowing it to transport oxygen throughout the bloodstream.
Explanation:Hemoglobin is a protein found inside red blood cells and is responsible for carrying oxygen (O2) to cells and carbon dioxide (CO2) to the lungs. It is made up of four symmetrical subunits and four heme groups that contain iron, which binds oxygen. The presence of iron gives blood its characteristic red color. Hemoglobin's structure includes two alpha subunits and two beta subunits, each of which can bind to an oxygen molecule, allowing the entire hemoglobin molecule to carry up to four oxygen molecules.