In the egg of bird, shell and shell membranes are
Permeable to ${O_2}$ and $C{O_2}$
Permeable to water only
Permeable to air only
Non-permeable
The eggs in which fate of every part of the egg becomes fixed are called
The skeleton and muscles originate in the development from or During embryonic development endoskeleton and muscles develop from which germinal layer
Coelom is found between the cavity of
During cleavage $DNA$ synthesis
$A$ : The most immediate effect of $FSH$ is the maturation of existing late primary or secondary follicle.
$R$ : $A$ rising level of $FSH$ causes the developing egg within the follicle to complete the first meiotic division to form a secondary oocyte.