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On average, the stomach produces 2 L of hydrochloric acid per day.
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There are more bacteria in your mouth than there are people in the world.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.
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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.