Question

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 ______

Answer 1

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.