Extra embryonic membrane provide protection and secure food for the developing embryo in amniotes.What is the significance of vestigial Yolk sac in mammals?
A-adaptive
B-evolutionary
C-protective
D-synthetic
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Answer:
Explanation:
yolk sac is responsible for producing blood cells in the growing foetus.
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yolk sac is not vestigial as it is initial site of erythropoiesis
it also contain primodial germ cells which will migrate into gonads of growing foetus
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