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Author Question: __________ is the process whereby new theories and refinements of existing theories are made (Read 274 times) |
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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
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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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There are approximately 3 million unintended pregnancies in the United States each year.
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Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.