The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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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.
Plants
Plants
Plants
Plants
Cell Signaling worksheet
Alpine tundra. Low-growing, hardy plants at a high altitude in Washington’s Cascade range.
