But it also is home to unique wildlife and it is fragile. The nations of the world have finally come to some agreement on why and how it should be preserved. The Nature of Ecosystems A. Overview of the Participants 1. Regions on the earth function as systems running on energy from the sun processed through various organisms. Primary producers are autotrophs that can capture sunlight energy and incorporate it into organic compounds.
Consumers are heterotrophs that feed on tissues of other organisms.
Herbivores eat plants. Carnivores eat animals. Parasites reside in or on living hosts and extract energy from them. Omnivores eat a variety of organisms. Decomposers are also heterotrophs and include fungi and bacteria that extract energy from the remains or products of organisms.