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Author Question: Which element has the atomic number 9? A) F B) Ne C) B D) Na E) ... (Read 37 times) |
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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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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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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.