Chapter 25 Slides Sections 1-3

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The Cambrian Explosion • The Cambrian explosion refers to the sudden appearance of fossils resembling modern animal phyla in the Cambrian period (535 to 5<strong>25</strong> million years ago) • A few animal phyla appear even earlier: sponges, cnidarians, and molluscs • The Cambrian explosion provides the first evidence of predator-prey interactions AP Biology © 2011 Pearson Education, Inc.
Figure <strong>25</strong>.10 Sponges Cnidarians Echinoderms Chordates Brachiopods Annelids Molluscs Arthropods AP Biology PROTEROZOIC Ediacaran PALEOZOIC Cambrian 635 605 575 545 515 485 0 Time (millions of years ago)
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Chapter 25 Slides Sections 1-3

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