Without genetic variation, a population cannot evolve in response to changing environmental variables and, as a result, may face an increased risk of extinction. For example, if a population is exposed to a new disease, selection will act on genes for resistance to the disease if they exist in the population.
Answer:
Receptor molecules on the surface of cells bind specific molecules called, in general, ligands.
Explanation:
These ligands can be hormones or different signaling molecules.
Answer:
The two main types of leukocytes are granulocytes and mononuclear leukocytes (agranulocytes). Leukocytes arise from hemopoietic stem cells in the bone marrow. Leukocytes are involved in pathogen recognition, phagocytosis (ingestion of particles), pathogen destruction, inflammation mediation, and antigen presentation.
Explanation:
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Answer:
" Often, two species face a similar problem or challenge. Evolution may then shape both of them in similar ways — resulting in analogous structures. For example, imagine two flower species that are not closely related, but both happen to be pollinated by the same species of bird."
Explanation:
False
Because the predators would have more food if the prey increased
