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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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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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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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Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.
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