The glass frog has transparent skin — its organs and beating heart are visible from outside.
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The fennec fox has large ears that help dissipate heat.
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Cats can rotate their ears independently.
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The human brain weighs about three pounds on average.
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Sea turtles have existed for over 100 million years.
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The Ice Age ended about 11,700 years ago.
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The Earth's inner core is solid despite extreme heat.
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The human eye adapts to darkness by increasing light sensitivity.
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The pacemaker regulates irregular heartbeats.
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