Essay
Draw a cladogram for the following animals: sponges, cnidarians, flatworms, echinoderms, chordates, mollusks, annelids, nematodes, and arthropods. On your cladogram indicate the points where the following evolved: (1) true tissues, (2) bilateral symmetry, (3) three germ layers, (4) segmentation, (5) protostome development, and (6) deuterostome development.
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