|
|
Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.
People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.
Looking at the sun may not only cause headache and distort your vision temporarily, but it can also cause permanent eye damage. Any exposure to sunlight adds to the cumulative effects of ultraviolet (UV) radiation on your eyes. UV exposure has been linked to eye disorders such as macular degeneration, solar retinitis, and corneal dystrophies.
![Transurethral resection of the prostate (TURP). As a treatment for BPH, part of the prostate gland i](https://biology-forums.com/gallery/47/medium_14755_16_10_12_12_27_39_94321928.jpeg)
![Symbolic interactionists stress that a basic characteristic of humans is that they attach meaning to ...](https://biology-forums.com/gallery/27/medium_482573_20_04_17_1_00_36_279631887.png)