|
|
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.
The oldest recorded age was 122. Madame Jeanne Calment was born in France in 1875 and died in 1997. She was a vegetarian and loved olive oil, port wine, and chocolate.
Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.
There are 20 feet of blood vessels in each square inch of human skin.
![Some playgrounds near streets with heavy traffic may still have high levels of lead from gasoline ...](https://biology-forums.com/gallery/47/medium_667187_21_02_17_5_23_24_256091816.png)
![HIV-positive men with a high number of life stressors progress more quickly to AIDS than those with ...](https://biology-forums.com/gallery/27/medium_660366_08_04_17_10_05_18_27553475.jpeg)