Explanation:

 Statement 1: Protozoa mainly feed on bacteria, but they also eat other protozoa, and sometimes fungi. Some protozoa absorb food through their cell tissues.
Statement 2: All protozoa digest their food in stomach-like compartments. As they digest, they make and give off nitrogen, which is an element that plants and other higher creatures can use.
Statement 3: Most protozoa do us no harm. But there are a few that cause diseases. One type of amoeba can live in human intestines. It feeds on red blood cells and causes a disease known as dysentery. Another species of protozoa can sicken hundreds of thousands of people when it gets into the tap water. Perhaps the best-known deadly protozoa causes malaria.