The blue whale's heartbeat can be detected from miles away using underwater acoustic sensors.
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The barreleye fish has a transparent head and upward-facing eyes.
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The learned helplessness theory explains passivity after repeated failure.
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The Earth's inner core is primarily iron and nickel.
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Polar bears have a thick layer of fat to retain body heat.
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Pandas have a specialized wrist bone that functions like a thumb.
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The Megalodon lived millions of years before humans appeared.
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The human stomach can expand significantly after a large meal.
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Hyenas have powerful jaws adapted for crushing bone.
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