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Did you know?
Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
Did you know?
Asthma cases in Americans are about 75% higher today than they were in 1980.
Did you know?
The top five reasons that children stay home from school are as follows: colds, stomach flu (gastroenteritis), ear infection (otitis media), pink eye (conjunctivitis), and sore throat.
Did you know?
Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.
Did you know?
There are more bacteria in your mouth than there are people in the world.
![The common squirrel monkey (Saimiri sciureus) is a small New World primate from the Cebidae (squirre](https://biology-forums.com/gallery/47/medium_12359_08_06_12_5_26_17.jpeg)
![Photograph of the flea that transmits Yersinia pestis to cause bubonic plague, called the oriental r](https://biology-forums.com/gallery/47/medium_14755_11_11_12_7_20_12_100441848.jpeg)