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Author Question: IUDs may help protect against cervical cancer. Indicate whether the statement is true or ... (Read 49 times) |
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.
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There are more bacteria in your mouth than there are people in the world.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.