In 2-3 sentences, summarize how variation impacts natural selection

Increasing genetic variation and the environmental effects on that variation form the basis for natural selection. Natural selection is a theory that states that those individuals who are best adapted to live in an area will survive and reproduce.

Explanation:

-hails tea

explanation:

-t poses

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.