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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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Symptoms of kidney problems include a loss of appetite, back pain (which may be sudden and intense), chills, abdominal pain, fluid retention, nausea, the urge to urinate, vomiting, and fever.
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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).
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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).
![Young male Pacific Walruses on Cape Pierce in Alaska. Note the variation in the curvature and orient](https://biology-forums.com/gallery/47/medium_27599_22_04_12_7_15_08.jpeg)
![Young boy with characteristic nasal crease from the repeated action of the “nasal salute” caused ...](https://biology-forums.com/gallery/47/medium_2137_18_05_12_3_17_20.jpeg)