Answer:
there are many causes to why a person drowns but the most common reasons are an inability to swim, panic in the water, leaving children unattended near bodies of water, falling through thin ice, and alcohol consumption while swimming or on a boat.
Explanation:
What is the first cell after fertilization called?
Final answer:
After fertilization, the zygote undergoes mitotic divisions through a process called cleavage. By day four, it forms a solid ball of cells known as the morula. With further divisions and the formation of a fluid-filled cavity, it becomes a blastocyst.
Explanation:
The first cell formed after fertilization is called the zygote. This single cell undergoes a process known as cleavage, which involves several mitotic divisions that increase the number of cells without increasing the overall size. By approximately the second day after fertilization, the zygote has divided to form two cells, and these mitotic divisions continue every 12 to 24 hours. By day four, the cells arrange into a solid ball called a morula. Eventually, more divisions occur, and a fluid-filled cavity forms, transforming the structure into a blastocyst, which consists of an outer layer of cells called the trophoblast and an inner cell mass called the embryoblast, with the cavity being the blastocoel.
How do you do letter c
Answer:
The gene that appears more in the family tree is dominant
The gene that appears less is recessive.
It seems that all the white shapes are dominant and the black shapes are recessive.
Which sources of nutrient pollution are mentioned and shown in the video? Check all that apply.
Answer: farms, laundry detergent‘s,pet waste, water treatment plants
Explanation:
The primary sources of nutrient pollution mentioned in the video are the overuse of artificial fertilizers, industrialization, urbanization, and the biomagnification of harmful substances in aquatic food webs.
Explanation:
The video mentions several sources of nutrient pollution that have a significant impact on aquatic ecosystems. One of the primary sources is the inappropriate use and overuse of artificial fertilizers in both agricultural and residential settings. These fertilizers are rich in nitrogen and phosphorus compounds, which can leach into drainage systems and end up in lakes and coastal marine ecosystems.
Another major source of nutrient pollution underlined is industrialization and urbanization. Elements of human waste, chemicals, and heat stemming from concentrated human settlements contribute significantly to water pollution. Food production methods that require liberal use of nitrogen and pesticides result in these substances re-entering the water system, further proliferating nutrient pollution.
The video also addresses pollution that occurs through human activities' excessive introduction of naturally limited nutrients like iron, nitrogen, and phosphorus to aquatic ecosystems. The video highlighted the biomagnification of substances such as polychlorinated biphenyls (PCBs) and heavy metals (mercury, lead, cadmium) in aquatic food webs, which can adversely affect human health.
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A researcher incubates a cell with radiolabeled amino acids. These amino acids are incorporated into the proteins as they are synthesized by the cell. Select which piece of data would indicate the incorporation of radiolabeled amino acids during protein synthesis? A) Radioactivity levels would increase first at the nucleus, followed by the Golgi, and then the cell membrane. B) Radioactivity levels would increase first at the nucleus, followed by the ribosomes, and then the secretory vesicles. C) Radioactivity levels would increase first at the rough endoplasmic reticulum, followed by the Golgi, and then the secretory vesicles. D) Radioactivity levels would increase first at the rough endoplasmic reticulum, followed by the nucleus, and then the secretory vesicles.
Answer:
During an investigation, the addition of radiolabeled amino acids during protein synthesis occurs when the data shows high levels of radiation in protein synthesis, packaging and transport, which is equivalent to saying that radioactivity levels would first increase in the rough endoplasmic reticulum, followed by the Golgi and then the secretory vesicles (option C).
Explanation:
Protein synthesis in the cell is a process that involves the formation of polypeptide chains with the successive incorporation of amino acids.
RNA, which contains the sequence of triplets or codons that form the genetic code, is coupled to the ribosomes. Each codon or triplet consists of three nucleotides and encodes specific amino acids.
The RNA chain contains a specific nucleotide sequence and determines the assembly of amino acids to a polypeptide chain, by the action of ribosomes present in the rough endoplasmic reticulum.
In the Golgi apparatus, the proteins formed are conjugated, with the addition of carbohydrates or lipids, and arranged in secretory vesicles for transport.
In these steps, where the labeled amino acids are present, the levels of radioactivity would increase in the rough endoplasmic reticulum, the Golgi apparatus and the secretory vesicles.
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Answer:
the answer is c
Explanation:
What natural object inspired the structure of a submarine ballast tank?
Answer:
The blowfish or argonaut octopus inspired the structure of submarine ballast tank
Explanation:
A submarine can be usually referred to as a submersible warship that is constructed in such a way that it can be operated at a great depth below the sea or oceans, and is mainly used for defense purposes.
This submarine is comprised of a ballast tank, and as it dives, the ballast tanks are occupied by water and the air present inside this ballast tank is allowed to move out until the overall density becomes larger than the surrounding water, resulting in the sinking of the submarine.
This ballast tank structure was inspired by the aquatic fish namely the blowfish or argonaut, whose body resembles the shape of a submarine.
The agricultural revolution took place approximately _____. A. 100 years ago B. 300 years ago C. 100,000 years ago D. 10,000 years ago
Answer: b
Explanation:
Which of the following is likely to happen at a location that has huge reddish sandstone rocks?
Sinkholes may form due to wind erosion.
Sinkholes may form due to water erosion.
Arches may form due to glacial movement.
Arches may form due to weathering and erosion.
P.s Please answer fast!!!
And also if you answer quickly that would be much appreciated!!!
Final answer:
The most likely geological process at a location with reddish sandstone is the formation of arches due to weathering and erosion, not the formation of sinkholes which are common in limestone regions, nor due to glacial movement.
Explanation:
At a location with huge reddish sandstone rocks, the likely geological process to occur is the formation of arches due to weathering and erosion. This occurs because wind, water, heat, and cold all contribute to the weathering of rocks, breaking them down into smaller pieces. Over time, weathering and erosion can lead to the creation of unique geological formations such as arches, where non-resistant rock gets worn away, leaving more durable materials behind to form the arch.
Sinkholes, on the other hand, commonly form in areas of limestone where water erosion and chemical weathering can create subterranean voids that eventually collapse, which is not the typical process for the formation of features in sandstone environments. Furthermore, sandstones do not typically form due to glacial movement, as they are a result of sediment deposition in environments where oxygen is present, which leads to their reddish color.
25 POINTS Hi!! I really need some biology help!!! Please help with all the questions!
Answer:
D
Explanation:
Because Speciation is the creation of a new species through the process of evolution.
In the 1600's, Robert Hooke, and English scientist, used a crude microscope to examine bits of cork. Cork is derived from the bark layer of certain trees. Upon seeing the cork under the microscope, Hooke named the spaces within the cork 'cells', because they looked like empty rooms of a monastery. Although he coined the term cell, an ironic feature of cork is that it is dead plant material. Knowing this, what feature of cells would Robert Hooke NOT have been able to observe under the microscope while looking at cork?
Answer: In other word the other person was saying Robert Hooke was the one who said the cork looked like cells
Explanation: The answer is Hooke
What happens at location B on this map?
1. erosion
2. acid rain
3. crystalization
4. glacier formation
The phenomenon at location B on the map can range from erosion, acid rain, crystallization or glacier formation. Which happens depends on location B's environmental, geological and climatic circumstances.
The phenomenon that occurs at location B on the map can include a variety of geographical and environmental processes depending on the characteristics of that location. Examples of these phenomena can be erosion, acid rain, crystallization, and glacier formation. Let's discuss each one briefly.
Erosion is the process where natural forces like water, wind, and ice break down rocks and soil. It's an integral part of the geomorphological process that reshapes the Earth's features. Acid rain occurs when sulfur dioxide and nitrogen oxides are released into the atmosphere, interact with water and other chemicals to form acidic pollutants that fall to the earth, causing harm to the environment and human-made structures.
Crystallization is a process by which a solid forms, where the atoms or molecules are highly structured into a structure known as a crystal. Some of the ways by which crystals form in nature is from mineral solutions within the Earth's crust or at the Earth's surface. Glacier formation happens when snow remains in one location long enough to transform into ice. Over many years, layers of snowfall compress and turn into dense, flowing ice that we know as glaciers.
The precise process that occurs at location B would be determined by factors such as climate, geological structure, and human influence among others.
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The human activities in two locations are described below: Location A: Rampant use of plastic containers Location B: Excessive use of pesticides and fertilizers Which statement is most likely true? Location A will have poor air quality because plastic is biodegradable. Location A will experience water scarcity because plastic absorbs moisture. The population of honeybees will increase in Location B because production of crops will increase. The population of fish in Location B will decrease because the water is contaminated.
Answer:
The correct option is D) The population of fish in Location B will decrease because the water is contaminated.
Explanation:
Excessive use of pesticides and fertilizer has very toxic effects on the wild life of the nearby oceans and seas. The toxic elements of the pesticides and fertilizers get eroded into the nearby lakes and rivers due to situations like flood etc. When such toxic elements and compounds enter the lakes and rivers, they cause the death of the fishes and other organisms present in the sea as they are poisonous. This causes that population of the fishes to decline.
Answer:
The population of fish in Location B will decrease because the water is contaminated.
Explanation:
by using pesticides and fertilizers to get rid of bugs eating your plants, the pesticides and fertilizers will stay in the air until blown or have fallen into whatever water source it could have fallen into, and contaminate that water source, whether close or far.
Explain how high blood cholesterol develops in someone with a genetic disorder versus someone who eats a high-fat diet
Answer:
Cholesterol can be described as the organic, fat-like steroid which is found in cells of an organisms body.
A person with a genetic disorder for high blood cholesterol will inherit the trait in a genetic manner from his family. He will have genes which allow for high levels of cholesterol to be produced in the body.
On the other hand, a person who eats a high- fat diet will have high levels of cholesterol due to his diet. He will not carry the disorder from his family and will neither pass on the high cholesterol situation in his offsprings.
What is the difference between genus and species?
Answer:
A genus ranks just above the species in an organism's taxonomic hierarchy. A genus is made up of any number of species, while a species is composed of any number of subspecies or breeds.
Explanation:
Answer:
alot of difference
Explanation:
Which statement describes the light reaction of photosynthesis?
O
Carbon dioxide is put together with glucose.
O
Water molecules are split apart.
O
Air and water create energy for a plant.
O Water molecules are combined to make food.
Answer:
The correct option is B) Water molecules are split apart.
Explanation:
Photosynthesis can be described as a process in which plants make glucose and oxygen from carbon dioxide and water in the presence of sunlight. There are two main types of reactions occurring during this process which are known as the light reactions and the dark reactions.
During the light reactions, energy from the sun is used to drive electrons from the water molecule. ATP and NADPH molecules are generated temporarily which are used during the dark reactions.
Final answer:
Water molecules are split apart. The light reaction of photosynthesis splits water molecules apart, a process energized by sunlight captured by chlorophyll, which also results in the production of oxygen, protons, and electrons.
Explanation:
The correct statement that describes the light reaction of photosynthesis is: Water molecules are split apart.
In the light-dependent reactions, chlorophyll absorbs energy from sunlight, which is then used to convert water (H₂O) into oxygen (O₂), protons, and electrons. This occurs when water molecules are split apart, a process also known as photolysis. This stage of photosynthesis is crucial for the plant's subsequent production of glucose.
The overall equation for photosynthesis is 6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂. However, only the first half-reaction involves the light-dependent reactions where water is split to release oxygen and provide the necessary electrons and protons for the later stages of photosynthesis.
If a heterogeneous woman with traits for dark hair and freckles has a bay with a man with the same traits what is the chance their child would be born no freckles and light haired
Answer:
The correct answer is [tex]\frac{1}{16}[/tex] or zero, depending on the fathers genotype.
Explanation:
According to the question, dark hair phenotype is dominant over light hair. freckled phenotype is dominant over non-freckled phenotype.Let for hairs, dominant allele be D and the recessive allele be d.Let for freckles, dominant allele be F and the recessive allele be f.According to the question, the mother is heterozygous for both the traits, that is, she has the genotype, DdFf and phenotype, dark hair and freckles.But the father is said to have the same traits but not mentioned to be homozygous (DDFF) or heterozygous (DdFf).If he is homozygous, then he would produce only DF gametes.The mother produces the following gametes : DF, Df, dF, df.On crossing homozygous father (DDFF) with heterozygous mother (DdFf), all the offspring will have dark hair with freckles, so probability of obtaining a child with light hair and no freckles is zero.If both the parents are heterozygous, DdFf,Crossing them,DF Df dF df
DF DDFF DDFf DdFF DdFf
(D/F) (D/F) (D/F) (D/F)
Df DDFf DDff DdFf Ddff
(D/F) (D/NF) (D/F) (D/NF)
dF DdFF DdFf ddFF ddFf
(D/F) (D/F) (L/F) (L/F)
df DdFf Ddff ddFf ddff
(D/F) (D/NF) (L/F) (L/NF)
In the above cross, in the brackets (), D means dark hair.F means freckled.L means light hair.NF means non-freckled.The phenotypes observed are :Dark hair with freckled - 9.Dark hair with non-freckled - 3.Light hair with freckled -3.Light hair with non-freckled - 1.Probability that a child born would be light haired with no freckles (ddff) is [tex]\frac{1}{16}[/tex].1.6. Sierra is asked to demonstrate how carbon travels from the atmosphere to living organisms, then
back to the atmosphere. She draws a diagram showing carbon dioxide from the atmosphere being
taken in by a plant. An animal then consumes the carbon dioxide in the plant, uses it as a source of
energy, then exhales, returning the carbon dioxide to the atmosphere.
What step in this diagram needs to be corrected?
A. Animals do not release carbon dioxide; only plants do.
B. Animals do not use carbon dioxide as an energy source; they use carbohydrates.
C. Plants do not transfer carbon to animals; animals absorb it directly from the atmosphere.
D. Plants do not absorb carbon dioxide from the atmosphere; they only absorb it from the ground.
Answer:
B. Animals do not use carbon dioxide as an energy source; they use carbohydrates.
Explanation:
The most readily form of energy that an animal requires is carbohydrate molecules. Monosaccharide carbohydrates can be easily broken down and hence are the best sources of energy. Carbohydrates are broken down in the process of cellular respiration to generate ATP. ATP is the energy driving molecule which is required by every cell of an organisms body to carry out its normal metabolic functions. Hence, animals use carbohydrates as a source of energy, not carbon dioxide.
Final answer:
B. Animals do not use carbon dioxide as an energy source; they use carbohydrates. During respiration, animals then release carbon dioxide back into the atmosphere, correcting the step in Sierra's diagram.
Explanation:
The step in Sierra's diagram that needs correction is the statement that an animal consumes the carbon dioxide in the plant and uses it as a source of energy before exhaling it back into the atmosphere. The correct process is that animals consume the carbohydrates in the plants, not carbon dioxide, and these carbohydrates are then used as a source of energy. When animals respire, they release carbon dioxide back into the atmosphere, completing the carbon cycle.
Uses of bacteriophage in genetic engineering
Answer:
Phage particles can be used directly carrying the vaccine antigens expressed on their surfaces. But in case of DNA vaccines the sequences that are essential for the vaccine antigen synthesis are incorporated into the phage genome and the phage would then act as vehicle for the delivery of DNA vaccine [13].
Explanation:
Question 5 of 10
2 Points
Where are you most likely to find plant roots?!
O A. Chorizon
O
B. O horizon
OC. A horizon
O
D. B horizon
SUBMIT
Answer:
The plant roots are most likely found at "horizon".
Explanation:
Plant roots are extremely likely to occur in topsoil (horizon). Plant roots are organs which consume water and nutrients. Topsoil or front layer consists of minerals and decomposed organic matter and is also very dense in color, known as humus.
In this layer the plant roots grow primarily. The humus is composed of nutrients that sustain plants. The humus often soaks up and is easier to hold water. In this soil horizon the plurality of plant roots expand, and plants consume nutrients and water from this coating.
A Horizon APEX USERS
Which of the following characteristics suggests that whales evolved from terrestrial animals?
A) whales feed their young milk
B)whales use a tail fluke for locomotion
C) whales have lunges and breath air
D)whales lack hind limbs
Answer:C) whales have lunges and breath air
Explanation:
Whales does not breathe air or extract oxygen that dissolve in water through gills or directly through skins like other aquatic animals.
Unlike fish that has gills (feathery organ full of blood vessels) that helps it breathe by taking water into its mouth and forcing it out through the gill passages.
Whales has lungs and breathe through the nostrils called a blowhole, located right on top of their heads, whales have two blow holes (with exception of sperm whales)
Answer:
C) whales have lungs and breath air
Explanation:
please can someone help? Questions attached :)
Answer:
c) 1.05 hours
d) 35%
Explanation:
c) You answer is correct. Cell division takes 5% of the total time, and the total time is 21 hours. 5% of 21 is
[tex]\frac{21}{100}[/tex] x 5 = 1.05 hours, which is the same as 63 minutes or 1 hour and 3 minutes.
d) Each marker represents 5% of the time (there are 20 markers in the whole circle). DNA copying is spread over 7 sections. Therefore, 7 x 5% = 35% time spent copying DNA
Suppose you have made the following hypothesis:The greater the height from which you drop a ball, the faster the ball will be traveling when it hits the ground because gravity has more time to speed it up.If you observed that a ball dropped from a height of 6 feet has a higher speed than a ball dropped from a height of 3 feet, does that evidence support the hypothesis?A.Yes, the evidence supports the hypothesis.B.No, the evidence contradicts the hypothesis.C.The evidence is not related to the hypothesis. please help
Answer:
The correct option is A) Yes, the evidence supports the hypothesis.
Explanation:
In the field of scientific research, a hypothesis can be described as a tentative statement which can either be proved right or wrong based on the results form the experiments we perform.
As the results from the experiment showed that the ball which was thrown from a greater height had a greater speed, hence this means that the evidence from the experiment supported the hypothesis.
5. Why are index fossils useful in dating rock layers?
Answer:
Fossils are used to determine the ages of rock layers.Index fossils are of organisms that lived over a wide area. They lived for a fairly short period of time. An index fossil allows a scientist to determine the age of the rock it is in.
Explanation:
Someone pls help me
9th grade biology
Asp
Which idea was Lamarck's theory of Evolution based upon?
natural selection
variation in populations
inheritance of acquired traits
descent with modification
Answer:
The Correct Answer is D. Natural selection provided a better explanation for what they observed in the natural world.
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The cooking of eggs on a hot stove is an example of which of the following?
Chemical property
Chemical change
Physical property
Physical change
Answer:
Chemical Change
Explanation:
The cooking of eggs on a hot stove is an example of a chemical change.
Hence, the correct option is B.
A chemical property is a characteristic of a substance that can be observed or measured without changing the composition of the substance. For example, the color, melting point, and boiling point of a substance are all chemical properties.
A chemical change is a change in the composition of a substance. When eggs are cooked on a hot stove, the proteins in the eggs denature, which means that they change their shape and structure. This is a chemical change because the composition of the eggs is altered.
The physical properties of the eggs, such as their color, texture, and shape, also change when they are cooked. However, these changes are not chemical changes because the composition of the eggs remains the same.
Therefore, The cooking of eggs on a hot stove is an example of a chemical change.
Hence, the correct option is B.
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Scientists use a standardized taxonomic system to separate organisms into hierarchical groups based on
similarities and differences in their structural and genetic characteristics
Which of the following best explains why a standardized classification system is important to the scientific
community?
It provides a detailed evolutionary history of all the known organisms on Earth
It allows different kinds of organisms to be easily identified based on their characteristics
It allows scientists to group organisms based on their personal preference
It prevents people who are not scientists from studying and identifying organisms.
it allows scientists to to group organisms based on their personal preference
it prevents people who are not scientists from studying and identifying organisms
It allows different kinds of organisms to be easily identified based on their characteristics
Explanation:
Classification is defined as the grouping of organisms based on their similarities and dissimilarities. The main aim of classification is to simplify the study of vast range of animals that exist in nature.
The scientists use a standardized method in which they follow a set of rules while studying and assigning a taxonomic rank to a newly studied organism.
The taxonomic hierarchy includes the following taxon-Kingdom, phylum,class, order, family, genus, species.
Beginning from Kingdom the percentage of similarities among the members keep on increasing while we move towards species.
A taxonomical rank is assigned to an organism by studying the similarities of that organism with already existing members of that taxonomic group.
Since, few characters are already studied well while classifying the earlier members the study and classification of new organism becomes much simplified and easier.
Answer:
It allows different kinds of organisms to be easily identified based on their characteristics
Explanation:
got it right in study island :>
If an atom has 16 protons, 14 neutrons, and 20 electrons, what is the atom's electrical charge?
The electrical charge of atom is equal to -4.
Explanation:An atom consists of protons, electrons and neutrons as its elementary particles of which:
Protons are positively chargedNeutrons have no charge (neutral)Electrons are negatively charged.When an atom has its number of protons equal to the number of electrons, the total charge on the atom is zero and it is termed as a neutral atom.
Given:
Number of protons : [tex]n_p = 16[/tex]
Number of neutrons : [tex]n_n = 14[/tex]
Number of electrons : [tex]n_e = 20[/tex]
Since, [tex]n_p \neq n_e[/tex], the atom is not neutral and has some electrical charge present.
Number of protons = Number of positive charges = + 16
Number of electrons = Number of negative charges = - 20
Since,
Total charge = (Number of positive charges) + (Number of negative charges)
[tex]= [( + 16 ) + ( - 20)] = (-4)[/tex]
OR
Total charge = Number of protons - Number of electrons
[tex]n_p-n_e = 16 - 20 = -4[/tex]
Therefore, the electrical charge of atom is equal to (-4).
A scientist is trying to determine the relationship between clams, snails, and squid. When she generates a molecular clock,
she is surprised to see that clams and squid are more closely related than clams and snails. Which did the molecular clock
data show?
Clams and squid have been evolving separately for a longer time than clams and snails.
Clams and squid have been evolving separately for a shorter time than clams and snails.
Clams and snails have more in common genetically than clams and squid.
Clams and snails are more similar in related structures than clams and squids.
Answer:
B. Clams and squid have been evolving separately for a shorter time than clams and snails.
Explanation:
A molecular clock is a genetic tool often used in Evolutionary Biology which states that the genetic material and proteins evolve over time at a relatively constant rate. Therefore, the differences in their genome depend on the common ancestor both species share.
In this case, clams and squid are more closely related than clams and snails. Therefore, they have been evolving separately for a shorter time than clams and snails.
The biosphere:
ends at the surface of the earth
extends miles below the surface of the earth
includes all the living organisms on the planet
all of the above
The biosphere includes all the living organisms on the planet
Explanation:
The biosphere includes all the living organisms on the planetThe biosphere is a global ecological system that forms the layer of the earth where life exists.The layers of earth that form the biosphere are lithosphere (rock), hydrosphere (water) and atmosphere (air) which together known as an ecosystem.Biosphere acts as a self-supporting and self-regulating system were the remaining of the dead plants and animals are released into soil and ocean thus, in turn, it is reabsorbed by plants for growing. The biosphere sometimes is one large ecosystem that is comprised of a complex community of living and nonliving things functioning as a single unit.Land plants are divided into two main groups. They are ________________ and _______________.
Answer:
Land plants are divided into two main groups. They are Mesophytes and Xerophytes
Explanation:
Xerophytes are types of plants that lives on dry habitat while Mesophytes are plants that lives on conditions that are optimal on dry land for growth.
Answer:
vascular; nonvascular
Explanation:
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