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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.
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Cyanide works by making the human body unable to use oxygen.