The amazon forest is dense. There are a lot of trees almost on top of each other. Grass and underbrush, then taller bushes and smaller trees, then middling tree

The amazon forest is dense. There are a lot of trees almost on top of each other. Grass and underbrush, then taller bushes and smaller trees, then middling trees, then really tall trees, and the different layers have tree crowns above each other. To get that biomass, to get a bush and two or three tree crowns above each other, you need a lot of well-adapted species. You need compatible species of trees, and you also need enough other species to make a functioning ecosystem.