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Author Question: The time for the Moon to orbit Earth, relative to the stars is A) 23 hours, 56 minutes. B) about ... (Read 31 times) |
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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The senior population grows every year. Seniors older than 65 years of age now comprise more than 13% of the total population. However, women outlive men. In the 85-and-over age group, there are only 45 men to every 100 women.
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Vaccines prevent between 2.5 and 4 million deaths every year.