Chapter 25 Slides Sections 1-3
Chapter 25 Slides Sections 1-3 Chapter 25 Slides Sections 1-3
The Cambrian Explosion • The Cambrian explosion refers to the sudden appearance of fossils resembling modern animal phyla in the Cambrian period (535 to 525 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 25.10 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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The Cambrian Explosion<br />
• The Cambrian explosion refers to the sudden<br />
appearance of fossils resembling modern<br />
animal phyla in the Cambrian period (535 to<br />
5<strong>25</strong> million years ago)<br />
• A few animal phyla appear even earlier:<br />
sponges, cnidarians, and molluscs<br />
• The Cambrian explosion provides the first<br />
evidence of predator-prey interactions<br />
AP Biology<br />
© 2011 Pearson Education, Inc.
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