Mammalian embryo is directly surrounded by
Amniotic cavity
Allantoic cavity
Primary digestive cavity
Yolk sac cavity
The correct sequence of spermatogenetic stages leading to the formation of sperms in a mature human testis is
The blastula of prototherians is called
The female structures that corresponds (homologous) to the scrotum of the male are
In embryonic stage RBC develops in
$A$ : After menopause the levels of blood gonadotropins will rise markedly.
$R$ : At the time of menopause all the ovarian follicles are converted into follicular atresia and the ovaries are not responding to the gonadotropins