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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.
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Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.
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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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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.