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Author Question: American children spend more time _________ than on any other activity except _________. a. ... (Read 82 times) |
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Everyone has one nostril that is larger than the other.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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The average adult has about 21 square feet of skin.
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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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IgA antibodies protect body surfaces exposed to outside foreign substances. IgG antibodies are found in all body fluids. IgM antibodies are the first type of antibody made in response to an infection. IgE antibody levels are often high in people with allergies. IgD antibodies are found in tissues lining the abdomen and chest.