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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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.