Question

which statement describes natural selection?
○ it is the primary mechanism for evolution.
○ it must act on structural traits.
○ it acts to cause overpopulation.
○ it causes learned skills to become heritable traits.

Explanation:

Natural selection is the process by which organisms better adapted to their environment tend to survive and reproduce more successfully. It is the primary mechanism driving evolution. Structural traits are not the only ones it acts on (it can act on physiological, behavioral traits too). It does not cause overpopulation (overpopulation is a pre - condition in some cases for natural selection to occur as there is competition). Learned skills are not heritable in the context of natural selection (only genetic traits are passed on).

Answer:

It is the primary mechanism for evolution.