Why are neurotransmitters destroyed after a nerve impulse is sent along? Please explain clear with the process of how a nerve impulse is sent along using synapses. Will give 15 points. Please help!

How do cells grow and reproduce to maintain homeostasis?

Nucleic acid certain protein cell membranes certain carbohydrates

Humans are believed to have evolved in coastal regions in east africa. the region had an abundant supply of fish for early humanoids to eat. when scientists analyze the fads gene they see an interesting pattern. people whose families have lived in this area of east africa for generation show a high level of diversity in alleles for the fads gene. conversely, people whose families had migrated inland a moderate distance from sources of fish showed a much lower diversity for fads gene alleles. additionally, the fads alleles found in people whose family has lived inland for generation are almost all gene alleles which produce fads proteins with a high level of function and activity. how do anthropologists explain this?