A freshly unfertilized egg of hen contains
One cell
$100$ cells
$1,000$ cells
$10,000$ cells
It's Obvious
The first sign of the growing foetus may be noticed by listening to the heart sound carefully through the stethoscope. Embryo's heart is formed _________.
Animal $\quad$ Gestation period
Blood flowing in umbilical cord is
Zona pellucida of mammalian egg serves which of the following purpose
Location and secretion of leyding cells are
In mammals the female secondary sexual characters are developed by the hormone
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