Listeria. Listeria is a bacterium that causes a serious infection called listeriosis. Around 300 deaths are caused by Listeria infection each year, according to estimates from a 2011 CDC report. Listeria bacteria are most commonly found in raw foods. Vegetables can be contaminated by soil and water carrying bacteria.
Human male reproductive system. The scrotum is the bag that holds the testicles (commonly called balls) in male mammals. It is made of skin and muscle and is found between the penis and anus. It is often covered in pubic hair and becomes tight when the male is aroused.
The same reasoning applies with equal force to the testicles. But unlike ovaries, descended testicles located outside the body cavity in the scrotum are common among many mammals in spite of all the obvious risks and disadvantages.We suggest that descended scrotal testicles in humans and many other mammals evolved to provide a situation specific means of activating sperm.he same reasoning applies with equal force to the testicles. But unlike ovaries, descended testicles located outside the body cavity in the scrotum are common among many mammals in spite of all the obvious risks and disadvantages.