It takes about 12 hours for food to complete its journey through the digestive system.
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The Megalodon lived millions of years before humans appeared.
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A sea anemone uses stinging cells to capture prey.
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Atmospheric rivers can deliver massive amounts of rainfall.
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The pacemaker regulates irregular heartbeats.
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Hyenas have powerful jaws adapted for crushing bone.
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The human body replaces many of its cells regularly.
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