At what age do girls typically reach puberty (in $years$)?

What are the functions performed by the testis in human beings?

Give two examples each of the following:
$(a)$ Plants having unisexual flowers
$(b)$ Agents of pollination
$(c)$ Physical changes on puberty that are common to both boys and girls.

What is the role of the seminal vesicles and the prostate gland?

Why does the lining of the uterus become thick and spongy every month?

What are the functions of the testes in a young male?