|
|
Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.
Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.
Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.
![A number of tree species can be interconnected by mycorrhizal fungi in the forests of British Columb](https://biology-forums.com/gallery/47/medium_33_17_02_12_5_40_33_1989598.jpeg)
![Traction is the application of a pulling force to maintain bone alignment during fracture healing. D](https://biology-forums.com/gallery/47/medium_14755_24_09_12_7_49_31_8986303.jpeg)