Explanation:
Forelimb provides body support during sitting or walking and absorption of impact forces during landing
Forelimbs carry the weight because of the angle between the stifle and hock in case of horsesForelimbs of whales helps in swimming whereas that of bats helps in swimming in the airThe actual forelimbs of these mammals do not seem to be optimally arranged because natural selection is generally limited to modifying structures that were present in previous generations and in previous speciesCompare and contrast cytokinesis in animal and plant cells.
Answer:
Cytokinesis occurs in both animal and plant cells. It is the division of the cytoplasm, which is the final stage of the cell cycle. In animal cells, the cell membrane pinches together around the middle of the cell to divide the cytoplasm. In plant cells, the process is a little different. Because the cell wall of a plant cell is rigid, it does not pinch in like the more flexible cell membrane in animal cells. Instead, a structure called a cell plate forms across the middle of the cell. The cell plate moves outward and eventually fuses with the cell membrane to divide the cell into two cells. Then, new cell walls form around the cell membranes.
Hope this helps : )
Explanation:
Cytokinesis in animal and plant cells contrasts as follows:
In animal cells, the cytokinesis process involves the formation of a division groove on the cell surface that extends and deepens until the cell divides in two.
This is due to the contraction generated by the contractile ring, composed of filaments of actin, myosin, and other structural and regulatory proteins.
As the ring narrows, the groove will be larger and the cytoplasm will be strangled until it reaches the point of cell separation. Eventually, the two daughter cells are formed.
On the other hand , cytokinesis in plant cells takes place after the formation of a separating septum known as a phragmoplast, which arises from the accumulation of vesicles that come from the Golgi apparatus and that contain material from the cell wall.
Once the phragmoplast comes into contact with the cell walls, the septum will form in the middle of the cell, making cell division possible.
Comparisons between both cytokinesis:
In animal cells, cytokinesis occurs by strangulation, while in plant cells it occurs by septation.The plant cell uses its vacuoles to increase its volume against cytokinesis while the animals do it through synthesis, which causes a greater energy expenditure.During cytokinesis the plant cells do not lose width in the center while with the animal cells due to strangulation they narrow.Therefore, we can conclude that cytokinesis is a cellular process whose purpose is the division of the stem cell's cytoplasm between daughter cells, it is not the same in animal and plant cells due to the physiological characteristics of each one.
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Imagine that you want to breed a species of rose that has a wonderful smell. You have many different types of roses, but none of the individual roses has the wonderful smell that you want. What is the best way to go about breeding a pure species rose with the trait that you want?
To breed a rose with a specific aroma when none of the present roses have it, you would use Mendel's methods of cross-pollination and repeated selection for the desired trait (i.e., the aroma) across several generations. Also, keep in mind that even if the aroma isn't prominent in one generation, it can still reappear in the following generations.
Explanation:To breed a rose species with a wonderful smell, even if none of the individual roses currently have that trait, selective breeding strategies - similar to the ones used by Gregor Mendel in his experiments with peas - can be employed. First, we need to identify roses that have any trace of the desired fragrance. Even if it's not the exact smell we want, these roses contain at least some of the needed genes. Then, following Mendel’s methodology, we would cross-pollinate these roses by transferring pollen from one flower to another to avoid self-fertilization. Over time, this approach will hopefully help to cultivate a stronger manifestation of the desired fragrance.
Mendel used a similar approach with seven distinct traits in peas, including flower color and seed shape, perform several rounds of hybridizations, and watched how these traits passed onto the next generation. Using Mendel's methods for breeding roses, one would continue to select the offspring roses that show the strongest expression of the desired trait (the wonderful smell) and breed them. This process would be repeated for several generations until the roses consistently produce the aroma desired.
One important point from Mendel’s work was the concept of concealed traits. Even if a trait does not appear in a generation (just as white flowers disappeared in one of Mendel's cross-breeds but later reappeared), it does not mean it has been lost. Hence, even if the wonderful smell does not appear strongly in some generations of roses, continued selective breeding can still foster its emergence.
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What happens at the junction between a nerve and a muscle to initiate muscle contraction?
Answer:
What we know as the motor plate or motor unit is the union between the nerve or rather the nerve terminal and muscle fiber.
When the nerve fiber enters a depolarization, thus generating an action potential in its membrane, conducting electrical energy along it triggers certain "communicators" to be released at the union with the muscle (motor unit) that will indicate the muscle to contracting, these "communicators" are called neurotransmitters and an example of them is acetylcholine or Ach, when released it binds to the specific receptor for the neurotransmitter of muscle tissue, thus generating it to contract the sarcoplasmic reticulum and increase intracellular calcification levels to carry out the shortening of the muscle fiber (muscle contraction).
Explanation:
Muscle fibers are classified into three large groups according to their function and physiology, we have smooth and striated muscle and, on the other hand, specialized or cardiac muscle that has a very particular characteristic, unlike the others, which is that it is autonomous. say that it has another mechanism to be induced to contraction and that it could control muscle contraction without the presence of a nerve or nerve terminal, this is because the cardiac muscle is essential for our life to contract to generate the pumping our blood and it is very risky to depend on a nerve terminal.
On the other hand, the nerves that have a myelin sheath envelope will drive their exciting stimulation to the muscle or muscle fiber more quickly since it is the saltatory method.
The nerve terminals act at the level of the intracellular concentrations of calcium of the muscular cells as we mentioned above, that is why a muscular cell when viewed under the microscope presents a REL (superplastic smooth endoplasmic reticulum) that acts as a calcium reserve for muscle contraction. Calcium is responsible for dislodging the topoisomerase from the active site where myosin and actin bind to generate the shortening of the Z lines.
Under a microscope smooth muscles are
Under a microscope, smooth muscles appear as elongated, spindle-shaped cells with a single, centrally located nucleus.
They do not have the striated appearance that skeletal muscles have, which is why they are called ""smooth."" The cells are typically arranged in bundles or sheets and are surrounded by a connective tissue sheath called the endomysium. The cytoplasm of smooth muscle cells contains actin and myosin filaments, which are responsible for the muscle's contractile properties, but these filaments are not arranged in the regular, repeating patterns seen in skeletal muscle, hence the lack of striations.
Smooth muscles are involuntary, meaning they are not under conscious control, and they are found in the walls of internal organs such as the stomach, intestines, blood vessels, and bladder, where they play a crucial role in functions like digestion, blood flow, and excretion."
Which factor has the least effect on the weathering of a rock? *
A) Composition of rock
B) Exposure of the rock to the atmosphere
C) The number of fossils found in the rock
D) Climatic conditions
Answer: I believe it’s C!
Explanation: fossils inside a rocks should have little to no effect on the weathering of a rock. I may be wrong though so forgive me lol
Weathering is a biological, chemical, or physical process that dissolves the Earth's surface minerals and rocks. It might be caused by temperature, acids, water, fumes, and so forth.
The factor that has the least effect is:
The number of fossils found in the rock is option C.
What are the factors that affect weathering of rocks?The rate and kind of weathering are affected by rock composition because the components of the rocks can enhance or reduce the rate of weathering.As air, water, heat, and humidity impact the rocks and minerals, atmospheric conditions and climate play a significant role in rock weathering.Fossils discovered inside rocks have no connection to the weathering process.Thus, the correct option is C.
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The cardiovascular system is also known as the ____ system
Answer:
it's also know as the circulatory system
Why do rocks on the sides of mountains weather faster than rocks on level ground?
Answer:
Rocks at sea level can be weathered by ocean waves.
Explanation:
Slope The steep sides of mountains and hills make water flow down them faster.
The following cell is most likely in which stage of mitosis
A. prophase
B. Metaphase
C. anaphase
Answer:
literally all of them??
Explanation:
The correct stage of mitosis for the cell is option C - anaphase.
Mitosis is the process by which a eukaryotic cell divides to form two genetically identical daughter cells. It consists of several stages: prophase, metaphase, anaphase, and telophase.
During anaphase, sister chromatids (identical copies of a chromosome) are pulled apart toward opposite poles of the cell. The centromere (the region that holds sister chromatids together) splits, allowing each chromatid to move independently. The spindle fibers (microtubules) attached to the centromeres shorten, pulling the chromatids toward the poles. As a result, each daughter cell will receive an identical set of chromosomes.
In the image, we see distinct sets of linear structures (chromatids) being pulled apart toward opposite ends of the cell. This arrangement aligns with the process of anaphase, where chromatids separate. The overall shape of the cell suggests division along the vertical axis.
Based on the characteristics observed in the image, we can conclude that the cell is in the anaphase stage of mitosis.
a gas stove is being used to boil water is what energy transformation
A) Chemical energy from the gas is transformed into thermal energy
B) Thermal energy from the gas is transformed into chemical energy
C) Electrical energy from the stove is transformed into light energy
Answer:
A
Explanation:
Chemical Energy, I did the test
Final answer:
The energy transformation that occurs when a gas stove is used to boil water is that chemical energy from the gas is transformed into thermal energy.
Explanation:
The energy transformation that occurs when a gas stove is used to boil water is option A) Chemical energy from the gas is transformed into thermal energy. When the gas stove is turned on, the natural gas undergoes combustion, which is a chemical reaction that releases thermal energy in the form of heat. This heat is transferred to the water, causing it to increase in temperature and eventually boil.
The circular folds of the small intestine enhance absorption by causing the chyme to spiral, rather than to move in a straight line, as it passes through the small intestine.
Answer:
This is true .
Explanation:
Digestion is the process by which food substances are broken down into smaller substances through enzymatic actions and then absorbed into the body as nutrients.
As food passes through the digestive tract, it becomes less complex and the nutrients are more readily available to the body.
The circular folds of the small intestine enhance absorption by causing the chyme to spiral, rather than to move in a straight line, as it passes through the small intestine.
Which chromosomes represents an alteration known as a deletion
A chromosomal deletion is when a segment of DNA is lost from a chromosome, often leading to genetic disorders such as Cri-du-chat syndrome. These deletions usually arise from unequal crossing over during meiosis, which can result in one gamete with a missing chromosomal segment.
Chromosomal deletions occur when a segment is removed from a chromosome, which can lead to a variety of genetic disorders. The chromosomal basis of inherited disorders includes conditions like Cri-du-chat syndrome, where a deletion on chromosome 5 leads to distinctive clinical features. Chromosomal alterations such as deletions are commonly a result of unequal crossing over during meiosis.
Chromosomal duplications, insertions, inversions, and translocations are other types of alterations that can have significant effects on an individual's phenotype. For example, during meiosis, one gamete might receive a chromosome with a duplicated segment while another gamete receives a chromosome with a deletion, hence altering the genetic information passed to offspring. This can result in phenotype variations and, in some cases, genetic disorders.
PLEASE HELP EASY 25 POINTS Based on this cladogram, which organism is most closely related to cow and deer? Why?
Without a provided cladogram, we can conceive that the organism most closely related to cows and deer would be whichever organism shares the most recent common ancestor with them, as depicted by the nearest branching point on a cladogram.
Explanation:Without a presented cladogram, I can provide a general explanation. In biology, we construct cladograms to illustrate the evolutionary relationships between different species. They represent hypotheses about the sequence of evolutionary events and shared characteristics of the organisms. For your question, to identify which organism is most closely related to cows and deer, one would look at the organism that shares the closest 'node' or branching point with cows and deer on the cladogram. The organism that branches off from the same point as the cow and the deer is the one most closely related to them.
This is because the closer two species or groups are located to each other on a phylogenetic tree or cladogram, the more recently they share a common ancestor. Therefore, if you find the organism that has the most recent common ancestor with the cow and deer, as represented by the nearest branching point on the cladogram, that is the organism most closely related to them.
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Which must be true for two organisms to be considered the same species?
A windstorm in a forest blows down the largest trees in a particular area of the forest. Soon, sun-loving plants sprout in the new clearing. What type of succession is this? What do you think the area will look like in 5 years? 50 years?
Answer:
Secondary succession
Explanation:
When a previously occupied area is re-colonized after a natural disaster or human activities that wiped out the previous community, then the type of succession is called a secondary succession. A practical example is abandoned farmland that a farmer left for a period of time and later revisited for farming afterwards.
Because the pioneer organism( sun-loving plants ) were already on ground it will be fast for them to populate the area,grasses will sprout up too. insects, dentritivores, reptiles will move into the habitats.
After 5years;The habitat is populated by shrubs, which owns the forest floors. small pine, oak may soon join.a stable climax community.
Assuming the community is not interfere with bigger dominant trees , e,g the oak developed and other tree developed to bigger tree , followed by more insects, birds, rodents, herbivores and some carnivores, This entire sequence of event may take 50 years, to reach this climax community.
Final answer:
Secondary succession occurs after a disturbance, like a windstorm, leading to a new growth of pioneer species. In 5 years, grasses and shrubs would cover the area, and in 50 years, young trees would establish, potentially leading to a climax community resembling the original forest.
Explanation:
The type of succession you're describing is known as secondary succession. This process occurs after a disturbance like a windstorm in a forest. Initially, sun-loving plants or pioneer species such as grasses and annual plants sprout in the new clearing because they're adapted to conditions of high sunlight. Over time, these species modify the environment, making it more suitable for other species that follow.
In 5 years, the area will likely be populated by fast-growing grasses and shrubs, as these species can quickly take advantage of the increase in available sunlight after the trees are gone. In 50 years, the area might start to look more like a young forest, with small trees like pine, oak, and hickory becoming more established, as they slowly replace the shrubs. These are known as intermediate species. Eventually, the area could develop into a mature forest similar to the one before the storm, a stage known as the climax community.
Look back at your answer to the previous question for tube C. Revise your answer to explain why there are more organisms at the top of tube C than at the bottom.
Answer: Tube C contains facultative anaerobes.
Explanation: They can survive with or without oxygen because they can make ATP through anaerobic and aerobic processes. Many facultative anaerobes prefer oxygenated environments, but they can adapt to low-oxygen conditions. This preference is why there are more organisms near the top of the tube.
The reason why more organisms are at the top of tube C than at the bottom is they can survive with or without oxygen because they can make ATP through anaerobic and aerobic processes. Many facultative anaerobes prefer oxygenated environments, but they can adapt to low-oxygen conditions. This preference is why there are more organisms near the top of the tube.
What adaptations do organisms have for dealing with low oxygen levels?In summary, given the stable presence of very low O2 levels in the minima, the primary adaptations of animals living within them are those that support aerobic metabolism by giving the animals remarkable abilities to extract O2 from water.
What animals can survive in low oxygen conditions?New research shows that mole rats can survive for hours in extremely low-oxygen environments, and can live for as long as an astonishing 18 minutes without any air at all.
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Lupus, a condition in which the body attacks its own cells, is an example of
List the classification categories for organisms from the broadest category to the most specific.
Answer:
Kingdom, Phylum, Class, Order, Family, Genus, Species
Reactions that require CO₂ take place in ________.
a. the Calvin cycle alone
b. the chloroplast, but not as part of photosynthesis
c. both the light reactions and the Calvin cycle
d. the light reactions alone
e. neither the light reactions nor the Calvin cycle
Answer:
The correct answer is: A) the Calvin Cycle alone.
Explanation:
These reactions happen in cells capable of photosynthesis.
The only out of these reactions that require CO2 to take place is the Calvin Cycle. The Calvin Cycle is a series of biochemical processes that occur in the chloroplasts during photosynthesis. The Calvin Cycle uses carbon dioxide (CO2) and water to produce glucose, which will give energy to the cells.
The light reactions occur during photosynthesis in the presence of light and involving photophosphorylation. The light reaction does not make use of CO2, as it takes solar energy and converts it into NADPH and ATP.
Answer:
the Calvin cycle alone.
Explanation:
Mitotic cell division is considered asexual because: Please choose the correct answer from the following choices, and then select the submit answer button. the daughter cells receive DNA from one parent cell, and the daughter cells are genetically identical. this form of cell division is most similar to binary fission. the daughter cells formed are genetically different. the daughter cells get different mixes of maternal and paternal chromosomes.
Answer:
Mitotic cell division is considered asexual because: the daughter cells get different mixes of maternal and paternal chromosomes.
Explanation:
In mammals, an increase in the concentration of sodium in the blood triggers the release of antidiuretic hormone (ADH) from the pituitary gland. As the concentration of sodium in the blood returns to previous levels, the release of ADH from the pituitary is reduced. Based on the information presented, which of the following describes the most likely role of ADH in maintaining blood homeostasis?
ADH promotes an increase in the movement of water into the bloodstream
A decrease in thyroxine levels
Answer:
In mammals, an increase in the concentration of sodium in the blood triggers the release of antidiuretic hormone (ADH) from the pituitary gland. As the concentration of sodium in the blood returns to previous levels, the release of ADH from the pituitary is reduced. Based on the information presented, which of the following describes the most likely role of ADH in maintaining blood homeostasis? In mammals, an increase in the concentration of sodium in the blood triggers the release of antidiuretic hormone (ADH) from the pituitary gland. As the concentration of sodium in the blood returns to previous levels, the release of ADH from the pituitary is reduced. Based on the information presented, which of the following describes the most likely role of ADH in maintaining blood homeostasis?
ADH promotes an increase in the movement of water into the bloodstream
Explanation:
ADH helps maintain blood homeostasis by increasing the reabsorption of water into the bloodstream, which dilutes the sodium concentration and lowers blood osmolarity, returning levels to normal.
Explanation:Based on the provided information, the most likely role of antidiuretic hormone (ADH) in maintaining blood homeostasis is to promote an increase in the movement of water into the bloodstream. When the concentration of sodium in the blood increases, it triggers the release of ADH, which then acts on the kidneys to insert aquaporins into the collecting ducts and tubules, making them more permeable to water. This action results in an increased reabsorption of water into the blood, thus diluting the sodium concentration and decreasing blood osmolarity. As the osmolarity falls back to normal levels, feedback mechanisms result in a reduced secretion of ADH, thus achieving homeostasis.
Phenothiazines block neurotransmitter dopamine molecules from attaching to synaptic receptor sites. True or False
Answer:
True
Explanation:
Phenothiazines can block dopamine receptor interactions in different brain regions including the hypothalamus, the basal ganglia, and the limbic system, and thus interfer with central and peripheral nervous systems. Phenothiazines can also block serotonin and noradrenaline receptors
Answer:
The correct answer is "True".
Explanation:
Phenothiazines are a type of organic compounds used to treat neurological disorders such as schizophrenia and psychotic disorders. Phenothiazines block neurotransmitter dopamine molecules from attaching to synaptic receptor sites, in the basal ganglia, the hypothalamus, and the limbic system. This molecular effect leads to sedation, which relieves the neurological disorders.
Which statements describe the benefits of artificial reefs? Select three options.
They can attract marine organisms.
They can form on top of existing reefs.
They can prevent beach erosion.
They can damage the natural ecosystem.
They can attract tourists to the area.
Answer:
They can attract marine organisms.
They can prevent beach erosion.
They can attract tourists to the area.
Explanation:
Answer:
A C E
Explanation:
Those are the answers on edge
The ________ of a sperm contains the enzymes essential for fertilization. The ________ of a sperm contains the enzymes essential for fertilization. acrosomal cap flagellum middle piece neck None of the answers is correct.
Answer:
head
Explanation:
because the head fuses with the egg
Virus structure includes bio molecules such as proteins and nucleic acids.__________ If false, why?
Answer:
.
Explanation:
Virus structure
1. Nucleic acid
2. Capsid
3. Envelop
Answer:
True !
All viruses contain nucleic acid, either DNA or RNA (but not both), and a protein coat, which encases the nucleic acid. Some viruses are also enclosed by an envelope of fat and protein molecules. In its infective form, outside the cell, a virus particle is called a virion.
Bodies of animals had been ____ over time by the conditions in their environments resulting in different forms they found in different locations
A) constant
B) shaped
Which type of organism is most likely to undergo sympatric speciation by polyploidy?
Answer:
Plant species that are capable of self-pollination and some degree of asexual reproduction
Explanation:
Complete Question -
Which type of organism is most likely to undergo sympatric speciation by polyploidy?
plant species that are capable of self-pollination and some degree of asexual reproduction
animal species with poor dispersal abilities whose populations exist in widely separated, small patches of habitat
animals, particularly those with highly selective females that select mates based on exaggerated traits
plant species that are incapable of asexual reproduction and do not self-pollinate
Solution -
Sympatric speciation occurs when a group of organisms living in a habitat become reproductively isolated from each other. It generally occurs through polyploidy in which offspring with more than the normal number of chromosomes are produced. However, a normal individual exhibit diploidy (i.e with two copies of each chromosome). Individuals with different number of chromosomes cannot mate thereby creating reproductive isolation. Sympatric speciation occurs in plants because they can self-fertilize which is not the case with the animals.
Thus, correct answer is "Plant species that are capable of self-pollination and some degree of asexual reproduction"
Drag each tile to the correct location.
Match each type of plant to the correct image.
If anyone could give me the correct answer I'd really appreciate it ! :)
The correct match of the plant to its image is:
A. The yellow flowers are angiosperm.
B. The pines in the second image are gymnosperm.
C. The green small grass is bryophytes.
D. The ferns' small leaves are pteridophytes.
What are angiosperms?
Angiosperms are the class of flowering plants whose seeds are present inside the fruit. They are considered the largest group of plants and contribute to 80% of green plants.
Bryophytes are the oldest plants like mosses and liverworts and pteridophytes are the fern plants and the gymnosperms are the one that bears seeds.
The image is attached below.
Thus, the match of the plant to its image is:
A. The yellow flowers are angiosperm.
B. The pines in the second image are gymnosperm.
C. The green small grass is bryophytes.
D. The ferns' small leaves are pteridophytes.
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Natural selection acts on the distribution of traits. When graphed, natural selection shifts the graph away (new population) from its original shape (original population). The original graph that serves as a baseline for the shifts in traits caused by natural selection is referred to as what type of distribution and is represented by what type of curve? a.) Normal distribution/Spiked-curve
b.) Abnormal distribution/Bell-curve
c.) Normal distribution/Bell-curve
d.) Abnormal distribution/Spiked Curve
Which is an adaptation?
A. A rabbit has fur that blends in with snow.
B. A bird breaks its wing in an accident.
C. A person learns how to do math.
D. A dog is trained to catch a ball.
Answer:
. A rabbit has fur that blends in with snow
Explanation:
School
An adaptation is A rabbit has fur that blends in with snow, which is in Option A, as an adaptation is a trait or characteristic that helps an organism survive and reproduce in its environment.
What is adaptation?Adaptations can be structural, behavioral, or physiological. Structural adaptations are physical features of an organism that help it survive and reproduce, such as the fur that helps a rabbit blend in with the snow, and adaptations are the result of natural selection, a process by which organisms with advantageous traits are more likely to survive and reproduce than those without those traits, so over time, the advantageous traits become more common in the population, while the disadvantageous traits become less common or disappear altogether.
Hence, an adaptation is A rabbit has fur that blends in with snow, which is in Option A.
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In two to three paragraphs, trace the path of blood flow through the heart. Be sure to name all of the heart chambers, valves, arteries and veins that the blood will travel through. Also describe the blood in terms of oxygen content all along its path through the heart.
Answer:
no someone is trying to hurt me pls help
Explanation: