Chapter 38 Key Terms
- p. 819: invertebrates, vertebrates, tissues, blastula, blastopore, gastrula, choanocytes, choanoflagellates
- p. 821: eumetazoans, radially symmetrical, Cnidaria
- p. 822: Ctenophora, cnidocytes, medusa, polyps, bilaterally symmetrical
- p. 823: cephalization, Platyhelminthes
- p. 824: organ, acoelomate, pseudocoel, pseudocoelomates, nematodes
- p. 825: coelom, coelomates
- p. 826: primary induction
- p. 827: parietal peritoneum, visceral peritoneum, circulatory system, molluscs, segmentation
- p. 828: annelid worms
- p. 829: somites, arthropods, jointed appendages
- p. 830: exoskeleton
- p. 831: protostome, deuterostome, cleavage
- p. 832: spiral cleavage, radial cleavage, archenteron
- p. 833: echinoderms, ossicles
- p. 834: secondary radial symmetry, water vascular system
- p. 835: chordates, nerve chord, notochord
- p. 836: pharyngeal slits, pharynx
- p. 837: tunicates, lancets, craniate chordates
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