In mammals the estrogens are secreted by the Graafian follicle from its
External theca
Internal theca
Zona Pellucida
Corona radiata
Aldosterone is secreted by
Chorion is composed of
$GnRH$ stimulates two hormones from anterior lobe of pituitary
The cleavage having incomplete division of egg is known as
A phenomenon of embryonic induction was first described in amphibia by