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The familiar sounds of your heart are made by the heart's valves as they open and close.

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About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.

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In Eastern Europe and Russia, interferon is administered intranasally in varied doses for the common cold and influenza. It is claimed that this treatment can lower the risk of infection by as much as 60–70%.

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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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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

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Video: Gas exchange - partial pressure, locations, external and internal respiration

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