The answer is c. Hope it help
Constant source of non extinguishable energy.
Answer:
One advantage is that secual reproduction provide variation which can help living things survive in different environment. Asexuals cannot have variation.
Explanation:
They just found out that the average couple is fertile for only about 6-7 days each month.
For some women, it is really easy to get pregnant, whereas others may have to try many times until they can have a baby. This is related to many things, such as whether the couple is having relations when the woman is ovulating, and such.