Release of spermatozoa from urethra by male animals is called
The secondary spermatocytes undergo the second meiotic division to produce four equal,
In mammals growing oocytes are surrounded by special nutritive cells called
$A$ : $LH$ acts on Sertoli cells for release of certain factors required for spermatogenesis.
$R$ : Spermiation occurs directly under influence of $LH$
Ovulation in mammals refers to