In human females, an event that reflects onset of reproductive phase is

Reproduction is essential for living organisms in order to

During adolescence, several changes occur in the human body. Mark one change associated with sexual maturation in boys

In human males, the testes lie in the scrotum, because it helps in the

Which among the following is not the function of testes at puberty?

1. Formation of germ cells

2. Secretion of testosterone

3. Development of placenta

4. Secretion of estrogen