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Biological Environment > Fish |
Earth Earlier Earlier 500 Million Years ago Later Earth After Animals Later |
This site tells the story of the history of the universe. Click Earlier and Later to follow the story. Note: Many facts have been simplified to make them easier to understand. |
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The animals we lump together as fish actually consist of several very different groups of vertebrates:
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Earth Earlier Earlier 500 Million Years ago Later Earth After Animals Later |
Biological Environment > Fish |
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Basic Information |
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