Answer: The cornea and aqueous humor form an outer lens that refracts (bends) light on its way into the eye. This is where most of the eye's focusing work is done. The colored circular membrane in the eye just behind the cornea is called the iris.
Explanation: hope it helps!
Waves of muscular contractions that propel the contents of the digestive tract are called peristalsis.
Well, they are a major cause of HPV. There are differents groups of STIs. On one side we have the bacterial STIs, and on the other we have the viral STIs. Hope this helps.