B. Embryos are being collected by the student on the field trip.
<span>A: The proportions of a population that are at different age levels make up the population’s age structure. </span>
Answer:
it's A
Explanation:
it's explaining your idea.
The generally accepted parts of modern cell theory include: All known living things are made up of one or more cells. All living cells arise from pre-existing cells by division. The cell is the fundamental unit of structure and function in all living organisms
