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Author Question: The two most abundant gases in the atmosphere are A) nitrogen and oxygen. B) water vapor and ... (Read 76 times) |
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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Russia has the highest death rate from cardiovascular disease followed by the Ukraine, Romania, Hungary, and Poland.
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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.