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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.
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The average adult has about 21 square feet of skin.
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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
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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.