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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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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.

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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.

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There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).

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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.

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