Highlight the topic sentence from paragraph 2.

2.When scientists talk about rainforests, they talk about the three sections or layers of them. The bottom layer is called the “ground layer”. Here live people, animals and plants. The ground is lush and damp. The next layer is the “understory” which is bushy.You can find trees and animals in this layer, too. The top is called the “canopy”.It is very thick. Very little light gets in, so the rainforest is dark. The canopy is the protection for the rainforest.