Blastopore is found in

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(C) During the process of gastrulation,the embryo undergoes significant morphological changes.In the gastrula stage,a new cavity called the archentero

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Gastrula and is opening of archenteron

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(C) During the process of gastrulation,the embryo undergoes significant morphological changes.In the gastrula stage,a new cavity called the archenteron (primitive gut) is formed.The blastopore is the opening through which the archenteron communicates with the exterior of the embryo.Therefore,the blastopore is a characteristic feature of the gastrula stage.

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