Which of these scenarios illustrates natural selection due to behavior

How do living things obtain phosphorus

Amino acids contain the elements carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur. of the 20 amino acids found in humans, 11 are called "nonessential" because they can be manufactured by the body when needed. which elements in these 11 amino acids are commonly obtained from the metabolism of sugar molecules?

Procedure in pregnancy to have access to fetus. what do you call this procedure?