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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).
Best Answer: So that lots of ATP can be produced, which can then release energy for active transport. Remember that epithelial cell are cells that release substances and can take substances in (exocytosis and endocytosis). This requires energy, so there are therefore lots of mitochondria. Source(s): A-level Biology.