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What characteristic is unique to echinoderms? A a water vascular system B. larvae with bilateral symmetry C a lack of segmentation D. suction-cup-like feet Features unique to mammals include A. the presence of hair B. being endotherms C having no egg-laying members D. extended parental care of the young are the mammalian group that lay eggs. A. Eutherians B. Tunicates C. Monotremes D. Marsupials Unique features of vertebrates include the presence of a(n) A. skull and backbone B. notochord C pharyngeal slit D. endoskeleton What does the term tetrapod mean? A. B. C. D. having four feet living on land living a double life egg-laying The arthropod skeleton is composed of A. cellulose B. peptidoglycan C. chitin D. glycogen There are more species of than of any other type of animal. A. molluscs B. nematodes C. chordates D. arthropods How do New World monkeys differ from Old World monkeys? A. B. C. D. New World monkeys have nails; Old World monkeys have claws. Old World monkeys are arboreal. New World monkeys have a prehensile tail. New World monkeys have enhanced depth perception.