The human body has over 600 muscles.
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The Earth's rotation causes day and night cycles.
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Water covers more than 70% of Earth's surface.
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The Earth's outer core is liquid metal.
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A rhinoceros has thick skin for protection.
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Vaccines train the immune system to recognize pathogens.
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The Earth's magnetic poles slowly shift over time.
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A horned lizard can squirt blood from its eyes as a defense.
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Stress hormones prepare the body for a fight-or-flight response.
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