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Author Question: How is nitrous oxide used? A) It is injected. B) It is inhaled. C) It is swallowed in pill ... (Read 55 times) |
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Thyroid conditions may make getting pregnant impossible.
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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).