In which of the following organism testes descends into scrotum in breeding season but in non-breeding season goes up

In mammals the estrogens are secreted by the Graafian follicle from its

After a sperm has penetrated an ovum in the process of fertilization, entry of further sperms is prevented by

When released from ovary, human egg contains

Tertiary egg membranes are lacking in mammals with the exception of the

Location - function : Testis and Ovary