A phenomenon of embryonic induction was first described in amphibia by
Aristotle
Spemann
Von Baer
Spallanzani
Acrosome of sperm is formed from
First polar body is produced during the formation of
In human females at the time of birth there are two million ova: how many of them normally reach maturity in the course of normal reproductive life
Study the flow chart. Name the hormones labelled as $A, B, C, D$ at each stage.
$A \quad B\quad C \quad D$