KEY CONCEPT Multicellular life evolved in distinct phases.

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Presentation transcript:

KEY CONCEPT Multicellular life evolved in distinct phases.

Paleozoic Years: 544 mya-248 mya Major events: Multicellular organisms first appeared. Members of every major animal group evolved. A huge mass extinction occurred at the end of the era Cambrian explosion: Cambrian period; a huge diversity of animal species evolved

Mesozoic Years: 248 mya-65 mya Known as: Age of Reptiles Major events: Mammals first appeared, crocodiles & dinosaurs arose. A mass extinction occurred & dinosaurs became extinct

Cenozoic Years: 65 mya-Present Major events: Placental mammals & monotremes evolved & diversified, primates evolved

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