AP BIOLOGY

Detailed explanation-1: -Rivers, creeks, lakes, ponds, and streams are all freshwater habitats. So are wetlands like swamps, which have woody plants and trees; and marshes, which have no trees but lots of grasses and reeds. Freshwater accounts for only three percent of the world’s water. (The rest is saltwater.)

Detailed explanation-2: -Animals such as koalas, sea turtles, and polar bears find themselves at the heart of the crisis, and those three are just a start. Some reports say a third of the world’s animal species will become extinct by the middle of the century if humans continue to release harmful greenhouse gases at the current rate.