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Author Question: The variable manipulated by a researcher in an experiment is called the _____ variable. a. ... (Read 89 times) |
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IgA antibodies protect body surfaces exposed to outside foreign substances. IgG antibodies are found in all body fluids. IgM antibodies are the first type of antibody made in response to an infection. IgE antibody levels are often high in people with allergies. IgD antibodies are found in tissues lining the abdomen and chest.
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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.