FishFish live in saltwater and freshwater all over the world. They come
in many different shapes and sizes, but most are covered in scales
and have strong fins for swimming. A fish's scales all lie in the
same direction to help the fish slip through water.
Like us, fish need oxygen to live. But instead of breathing air, they
absorb the oxygen in water. Water enters the mouth and is swept
over the gills. The oxygen passes from the water into tiny blood
vessels in the gills.
Fish often swim in groups called shoals. One reason they do this
is for protection. Many fish together can confuse a predator. This
makes it hard for the predator to single out a fish.
(Adapted from The Amazing World of Living Things, no date, p. 79
Bahasa Inggris / Think Globally Act Locally​