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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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).

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To maintain good kidney function, you should drink at least 3 quarts of water daily. Water dilutes urine and helps prevent concentrations of salts and minerals that can lead to kidney stone formation. Chronic dehydration is a major contributor to the development of kidney stones.

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