Evanthro Exam 3: Eras

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4 Terms

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Pre-Cambrian

first life, simple organisms, life in water

o   life in water

o   First life: 3.6 billion years ago as bacteria

o   Multicellular life appears late

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Paleozoic

Cambrian explosion, first vertebrates, life moves onto land

o   Cambrian explosion

o   First vertebrates

o   First land vertebrates (tetrapods)

o   Ends with massive extinction

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Mesozoic

age of reptiles (dinosaurs, first mammals & birds, end with extinction)

o   Dominance of dinosaurs

o   First mammals and birds

o   Ends with extinction

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Cenozoic

age of mammals (primates, apes, hominins, humans)  

o   65 mya – today

o   Massive adaptive radiation of mammals and birds

o   Primates (55 mya)

o   Apes (25 mya)

o   Hominins (5-7 mya)