Polar bears have black skin beneath their white fur.
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Fossils are formed when remains are preserved in rock over millions of years.
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The Earth is slightly flattened at the poles.
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A blue whale's heart can weigh over 400 pounds.
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The human spine consists of 33 vertebrae.
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The Earth spins at 1000 mph.
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Hyenas have powerful jaws adapted for crushing bone.
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Polar bears have a thick layer of fat to retain body heat.
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The fangtooth fish has some of the largest teeth relative to body size in the ocean.
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