Answer / Raju Kumar Roy

The yolk sac forms from the endoderm germ layer during embryonic development. It provides nutrients to the developing embryo, especially in animals with large yolks, such as birds and reptiles.

What are the archenteron and the blastopore? What are the destinations of the archenteron and of the blastopore?

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Are all animals coelomate?

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From which germ layer does coeloms originate?

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In which type of animals does the placenta exist?

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