| Lake
Baikal, Siberia |
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| Baikal
has more endemics than any other lake in the world. Its great age--more
than |
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| 25
million years--also sets it apart from any other freshwater lake as a
living |
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| laboratory
of evolution. During its life, 30 species of sculpins (above) have evolved. |
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| In comparison,
10,000-year-old Lake Superior has but four species. |
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