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| Period taking up most of Earth's history |
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| Very similar to modern-day bacteria |
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| At beginning of Paleozoic Era, a great number of organisms evolved. |
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Ancestors of octupus and squid appeared in this period |
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| In what period did plants start to live on land |
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| Animal lives part of time on land, part in water |
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| Scaly skin and lay eggs with tough, leather tails |
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| What caused the end of the Paleozoic Era? |
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| Scientists believed this supercontinent may have caused mass extinction. |
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| Warm-blooded vertebrate that feeds its young milk |
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Reptiles are still dominant vertebrates |
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| Second Mass Extinction caused by? |
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| What happened after asteroid impact? |
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| Huge amounts of dust and water vapor surrounded air, killed all animals, lack of sunlight |
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