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| Animals which could survive in water and on land. |
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| The first animals to move onto land because of thier exoskeleton. |
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| Seed-bearing plants which portected their developing seeds inside cones. |
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| A hypothesis which proposes that primitive cells acquired the precurors of mitochondria and chloroplastas by engulfing certain types of bacteria. |
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| Cells with a nucleus and organelles. |
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| A hard covering surrounding the body. |
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| Humans and their fossil relatives |
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| A group of fishes that important features that owuld allow descendants to colonize land: fleshy fins and an outpuching of the digestive tract (lungs) |
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| Animals with the abilidy to feed their young with secretions of the mammary glands. |
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| An episode which results in the extinction of many species. |
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| Hollow structures which resemble living cells. |
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| The movement in which solid plates of Earth's surface move above a fluid layer. |
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| A mammal group which includes humans, lemurs, monkeys, and apes. |
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| The first cells to arise which had no nucleus and obtained nutrients and energy by absorbing organic molecules from their environment. |
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| The result of a microsphere surrounding the right ribozymes creating something resembling a cell. |
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| The animals succeeding amphibians which had waterproof eggs, waterproof skin, and improved lungs. |
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| an RNA molecule which can also perform the functions of a protein enzyme. |
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| The idea that living things appeared from nonliving matter and from other unrelated forms of life. |
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