At what stage the primitive streak in the chick embryo is formed
$12$ hours incubation
$18$ hours incubation
$72$ hours incubation
$24$ hours incubation
It's Obvious
In some eggs, future organs can be demarcated even before cleavage begins. This type of development is called
Chorion is composed of
Antifertilizins are contained in
In human females ova are produced in
In human females at the time of birth there are two million ova: how many of them normally reach maturity in the course of normal reproductive life
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