Biology 17.3

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Biology 17.3

  1. 1. 17-3 Evolution of Multicellular Life<br />
  2. 2. Mass Extinction<br />Event in which many types of living things become extinct at the same time.<br />
  3. 3. Key Concept<br />Rich fossil evidence shows that early in the Paleozoic Era, there was a diversity of marine life.<br />
  4. 4. Key Concept<br />During the Devonian, vertebrates began to invade the land<br />
  5. 5. Key Concept<br />The mass extinction at the end of the Paleozoic affected both plants and animals on the land and in the seas. As much as 95 percent of the complex life in the oceans disappeared.<br />
  6. 6. Key Concept<br />Events during the Mesozoic include the increasing dominance of dinosaurs. The Mesozoic is marked by the appearance of flowering plants.<br />
  7. 7. Key Concept<br />During the Cenozoic, mammals evolved adaptations that allowed them to live in various environments- on land, in water, and even in the air.<br />

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