“Human Reproduction”

This work discusses human reproduction. It explains the male reproductive organs, which produce sperm cells and the hormone testosterone in males.

It also explains the female reproductive organs, including the ovaries, which produce ova (eggs) and hormones such as estrogen and progesterone.

In addition, it explains the process of fertilization, which is the fusion of a sperm cell with an egg cell to form a zygote, as well as the stages of formation and development of the embryo.