Tropical rainforests are distinguished not only by a remarkable richness of biota but also by the complexity of the interrelationships of all the plant and animal inhabitants that have been evolving together throughout many millions of years. As in all ecosystems, but particularly in the complex tropical rainforest community, the removal of one species threatens the survival of others with which it interacts. Some interactions are mentioned below, but many have yet to be revealed. Plants with similar stature and life-form can be grouped into categories called synusiae, which make up distinct layers of vegetation. In tropical rainforests the synusiae ...(100 of 6617 words)