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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Eating carrots will improve your eyesight. Carrots are high in vitamin A (retinol), which is essential for good vision. It can also be found in milk, cheese, egg yolks, and liver.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.