How does diversity in traits arise over generations? How can we determine the probability that an organism's expressed version of a trait will be passed on to its offspring?

Growth of chest hair, deepening of the voice, and muscle growth are secondary sex characteristics. which most likely affects the development of these traits? testes ovaries prostate gland vulva

Adigestive system that is a series of tubes beginning at the mouth and ending at the anus is a digestive system.

Nucleic acid certain protein cell membranes certain carbohydrates