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Author Question: The nineteenth century was a time of tremendous change throughout Europe and North America. The ... (Read 59 times) |
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.