Radiocarbon dating works because living organisms constantly absorb carbon-14, which decays at a known rate after death.
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Some species of frogs lay eggs on land instead of in water.
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Some butterflies use mimicry to avoid predators.
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Megalodon was one of the largest sharks to ever exist.
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Certain species of fish live near hydrothermal vents.
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Some species of jellyfish can shrink and regrow their bodies.
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A kangaroo cannot walk backward easily.
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