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Unformatted text preview: ingestion Evolution of predator prey relationships provided major reasons for natural selection Cambrian explosion Figure 17.6: 9 phyla o Sponges o Cnidarians Figure 17.11 True carnivores Marine Radical symmetry Jellies, sea anemones Gastrovasicular cavity o Flatworms Blood Fluke: Free-living Tape worms o Roundworms First phyla with a complete gut (stuff comes in one end goes out another) o Annelids o Arthropods o Mollusks o Echinoderms o Chordates...
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