Frogs have only one opening, called the cloaca, through which both feces and urine pass. Humans, however, possess two separate orifices for urine and feces to exit through.
Scratching insect bites can lead to infection, a superficial crusty infection of the skin.The scratching cause the skin around the bitten area to break open which causes infection. Example of insect that bites are mosquito, midge and flea among others.
<span>Smooth muscle, a type of specialized muscle cell, functions in A.) food digestion. Smooth muscle and striated muscle are able to contract. Unlike striated muscle, smooth muscle contracts slowly and automatically. Musculature of internal organs and the digestive system consists of smooth muscles. Therefore, they are involved in food digestion.</span>
