Which one of the following parts serves the function of primary organizer in frog
Dorsal tip of gastrula
Grey crescent area of frog
Chorda-mesoderm of gastrula
Any of the above
It's Obvious
Allantois develops from the embryonic
Fertilisation in human beings occurs in
The chemical fertilizer is present in
Which cell organelle is absent in human sperm?
Extra embryonic membrane amnion is not found in amphibians because
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