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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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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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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There are approximately 3 million unintended pregnancies in the United States each year.