Aperson feels tired, gains weight, and notices changes in metabolism. which gland would be the cause

a: the pancreas
b: the testes
c: the thyroid
d: the ovary

i believe the correct answer from the choices listed above is the first option. the scientists need to look at the   validity of data, claims, hypotheses, and observations before  developing an argument. they base their arguments on facts that are present and they make sure they have proofs. 

explanation:

name and explain one of the event that occurs during meiosis that increases the variation in offspring even more than simple reproduction?

it would be heredity