Zonary placenta is found in
Carnivore mammals
Herbivore mammals
Both $(a)$ and $(b)$
None of the above
In the given diagram find out, $A, B$ and $C$
In man the foetal membrane which forms the intimate connection with the uterine tissue is
After gastrulation the roof of archenteron is formed by
$A$ : The first sign of growing foetus may be noticed by listening to the heart sound through the stethoscope.
$R$ : By the end of second month of pregnancy, the foetus develops limbs and digits.
Nervous system in vertebrates develops from