To ensure effectiveness of reproduction in mammals
Formation of yolk sac
Retention of yolk sac
Reduced number of egg
Formation of placenta
Endometrium is found in
The yolk plug is a structure in gastrula which is formed by the protrusion of
A woman with a typical $28 \;day$ menstrual cycle is most likely to become pregnant as a result of sexual intercourse on ..... of cycle
Placenta acts as an endocrine tissue and produces several hormones like
$A.$ Human chorionic gonadotropin $(hCG)$
$B.$ Human placental lactogen $(hPL)$
$C.$ Estrogens
$D.$ Progesterone
Phallic organs in cockroach are related to