Vaccination campaigns have eliminated several diseases in many regions.
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Certain birds migrate seasonally to access food sources.
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Heart disease is the leading cause of death globally.
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The deep ocean remains largely unexplored by humans.
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In 1796, Edward Jenner developed the world's first vaccine by using cowpox material to induce immunity against smallpox, a breakthrough that led to the disease's global eradication.
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Penguins use their flippers to propel themselves underwater.
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The vampire squid feeds primarily on marine snow.
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A blue whale consumes vast amounts of krill daily.
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A sea lion can dive hundreds of feet underwater.
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