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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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During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.

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Everyone has one nostril that is larger than the other.

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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.

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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.

Face muscles Face muscles
Prokaryotic cells are have a relatively simple structure Prokaryotic cells are have a relatively simple structure
The Atmosphere’s Oxygen Came from Photosynthetic Organisms The Atmosphere’s Oxygen Came from Photosynthetic Organisms
Wild chimpanzees make and use simple tools to obtain food, learning tool making from one another. Wild chimpanzees make and use simple tools to obtain food, learning tool making from one another.
The ethanol molecule showing two carbon atoms, six hydrogen atoms, and one oxygen atom. The ethanol molecule showing two carbon atoms, six hydrogen atoms, and one oxygen atom.
How to reduce simple ratios How to reduce simple ratios
Video: Introduction to Spirometry

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