Answer:
D) begins as a cell, comes from an organ, is part of a system
Explanation:
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Answer:
1. directional selection
2. Hardy-Weinberg equilibrium
3. sympatric
4. This is allopatric speciation.
5. This is an example of stabilizing selection in a population because the organisms in the middle of the population have the best fitness for their environment.
6. The five conditions impacting this equilibrium are: mutations, nonrandom mating, genetic drift, migration, and natural selection.
7. Natural selection impacts single-gene traits because of the possible extinction of one trait or increase of another trait. If a trait is found to be not preferable in that environment, it could be eliminated through natural selection.
8. The total allele frequency in the Hardy-Weinberg equilibrium has to equal 1.:
from Penn Foster
Answer: nitrogen fixing bacteria
Explanation:
Nitrogen in the forms of nitrates, nitrites and ammonia are essential for the growth of the plants. Nitrogen present in the atmosphere is fixed in the soil by the nitrogen fixing bacteria. As plants cannot absorb nitrogen from the air. The bacteria convert atmospheric nitrogen into inorganic forms such as nitrates, nitrites and ammonia which are directly absorbed by the plants by their roots.
Reptiles have a special egg that feeds their young called an amniotic egg. Therefore, option (B) is correct.
Reptiles, birds, and certain mammals reproduce on land thanks to the amniotic egg's extraordinary evolution. Its shell protects the embryo from external dangers and desiccation. The amnion, which encloses the embryo in a fluid-filled chamber, is a key element of the amniotic egg. Amniotic fluid protects the embryo from mechanical shocks and allows gas exchange.
Reptiles can lay eggs on land without returning to water thanks to the amniotic egg, which marks the transition from aquatic to terrestrial life. This adaptability has helped reptiles colonise different ecosystems worldwide. Therefore, option (B) is correct.
Learn more about amniotic egg, here:
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