Formation of archenteron starts in

Morula

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Blastula

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Early gastrula

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Early neurula

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Solution

The correct option is C Early gastrula
Archenteron is considered as the primitive digestive cavity of the embryo at the gastrula stage of development in animals. It is formed by invagination of mesoderm and endoderm cells, opens to the outside by a blastopore, and finally develops into the gut cavity.
So the correct option is 'Early gastrula'.

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