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Author Question: A riser valve controls oxygen flow: A) to a ward or wing of a building B) between floors C) from ... (Read 43 times) |
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There are 20 feet of blood vessels in each square inch of human skin.
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The most dangerous mercury compound, dimethyl mercury, is so toxic that even a few microliters spilled on the skin can cause death. Mercury has been shown to accumulate in higher amounts in the following types of fish than other types: swordfish, shark, mackerel, tilefish, crab, and tuna.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Blood is approximately twice as thick as water because of the cells and other components found in it.