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Fill in the blank. The ____ of animals is based on scientists' current understanding of the evolutionary history of living species. Although they are radially symmetrical, echinoderms are more closely related to a human than to a jellyfish because they are ______

Sagot :

The behavior of animals is based on scientists' current understanding of the evolutionary history of living species. Although they are radially symmetrical, echinoderms are more closely related to a human than to a jellyfish because they have a skeleton.