The human eye can distinguish millions of colors.
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A sea anemone uses stinging cells to capture prey.
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The Trail of Tears forced Native American tribes westward in the 1830s.
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Sea turtles have existed for over 100 million years.
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In 2001, a Norwegian man survived a fall through ice by floating in near-freezing water.
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Certain reptiles regulate body temperature through basking.
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Stress hormones prepare the body for a fight-or-flight response.
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Octopuses have three hearts and blue blood.
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Some insects have compound eyes made of many lenses.
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