mutualism understory canopy ecosystem emergent predation forest floor food chain food web commensalism I learned that The is an environment where both living and non-living things exist and interact with one another. The different layers of the rainforest are and is is a series of feeding relationship, while an inter-connected food chain. an are is interaction where organisms live together without harming one another, for example, the orchids attached to the trunk of a tree without harming it. In both organisms benefit in the relationship. is kind of interaction in which one organism kills smaller organisms for food a​