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Author Question: A student nurse visiting a senior center tells the instructor, It's so depressing to see all these ... (Read 36 times) |
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The horizontal fraction bar was introduced by the Arabs.
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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.