'It is made up of a great variety of evergreen trees, with a distinct layer arrangement'. This refers to the

The description given, "It is made up of a great variety of evergreen trees, with a distinct layer arrangement" refers to the equatorial forest. The equatorial forest, also known as the tropical rainforest, is a type of forest found around the Equator that experiences high rainfall and has a warm and humid climate. It is characterized by a great variety of evergreen trees, with a canopy layer, understory layer, and forest floor. The canopy layer is the topmost layer that receives the most sunlight, followed by the understory layer, and then the forest floor, which is the lowest layer. The trees in this forest are adapted to the wet and humid environment and many have broad leaves to maximize photosynthesis.