(B) The blastopore is the primary opening that forms during gastrulation in the developing embryo. It serves as the opening of the archenteron,which i

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(B) The blastopore is the primary opening that forms during gastrulation in the developing embryo. It serves as the opening of the archenteron,which is the primitive gut cavity. In protostomes,the blastopore develops into the mouth,while in deuterostomes,it develops into the anus.