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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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.