(B) During the process of gastrulation,the blastula undergoes rearrangement of cells to form three germ layers. As the cells invaginate,a new cavity i

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(B) During the process of gastrulation,the blastula undergoes rearrangement of cells to form three germ layers. As the cells invaginate,a new cavity is formed which is known as the archenteron or primitive gut. The blastocoel is the cavity present in the blastula stage,which eventually gets obliterated as the archenteron develops.