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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 Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

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The human body's pharmacokinetics are quite varied. Our hair holds onto drugs longer than our urine, blood, or saliva. For example, alcohol can be detected in the hair for up to 90 days after it was consumed. The same is true for marijuana, cocaine, ecstasy, heroin, methamphetamine, and nicotine.

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An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.

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The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.

Uranus's aurorae against its equatorial rings, imaged by the Hubble telescope. Unlike the auror Uranus's aurorae against its equatorial rings, imaged by the Hubble telescope. Unlike the auror
Ghostly experiment Ghostly experiment
How Mendel’s theory accounts for the results of his experiment on the inheritance of seed color in ... How Mendel’s theory accounts for the results of his experiment on the inheritance of seed color in ...
In which experiment was the hormone glucagon used? In which experiment was the hormone glucagon used?
Tai chi stance with front foot pointing straight ahead and back foot at 45° angle, heels in line, ... Tai chi stance with front foot pointing straight ahead and back foot at 45° angle, heels in line, ...
Find the equation of the normal line to f(x)=sinx+cosx at x = π. Find the equation of the normal line to f(x)=sinx+cosx at x = π.
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