$A$ : Corticotrophin releasing hormone is a part of the clock that establishes the timing of birth.
$R$ : The signals for parturition originate from the fully developed foetus and placenta which induce mild uterine contractions called foetal ejection reflex.

At which phase, both $LH$ and $FSH$ attain a peak level?

A layer of cortical granules is found beneath the

$A$ : Failure of testes to descend into the scrotum causes sterility in man.
$R$ : Higher internal body temperature is not suitable for sperm development.

The chemical substance found in the surface layer of cytoplasm of spermatozoa is