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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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A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.

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Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.

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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.

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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.

Detritivores are often classified according to their body size as microflora, microfauna, mesofauna, Detritivores are often classified according to their body size as microflora, microfauna, mesofauna,
Organisms can be classified according to their source of energy Organisms can be classified according to their source of energy
U.S. Study on Identity Achievement With age, more young people are classified in identity achieveme U.S. Study on Identity Achievement With age, more young people are classified in identity achieveme
Cultural Variations in the Strange Situation Across cultures, most toddlers exhibit secure attachme Cultural Variations in the Strange Situation Across cultures, most toddlers exhibit secure attachme
Drugs can be classified as prescription or over-the-counter (OTC) drugs Drugs can be classified as prescription or over-the-counter (OTC) drugs
Animated! Organisms are classified into groups according to their characteristics Animated! Organisms are classified into groups according to their characteristics
Video: Effect of the environment on coat color in the Himalayan rabbit Animation

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