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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.
In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.
About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.
Cyanide works by making the human body unable to use oxygen.
![Herbivores of greatly different sizes can feed upon the same plant tissues. Though here we can see t](https://biology-forums.com/gallery/47/medium_33_09_09_11_10_11_48_17001115.jpeg)
![Details of plant population biology from repeat photography: (a) saguaro cactus in MacDougal Crater,](https://biology-forums.com/gallery/47/medium_33_17_02_12_6_59_59_20201820.jpeg)