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Depending on the species, the blastopore has been reported to become the mouth (protostomy), the anus (deuterostomy), both mouth and anus (amphistomy), or neither (i.e., the blastopore closes).
The fate of the germ layers is the same in all triploblastic animals. The blastocyst grows in size by obtaining nutrition from the uterus. Some cells separate from the inner cell mass (embryonic knob) to form endoderm in blastocoel.