Each species has its own niche or profession within its habitat. D. biosphere - everywhere on the planet where organisms exist. When males land for mating, they are instead eaten. 1. population explosions, few predators, parasites to keep them in check, at least for the first few years. I. Characteristics of Ecosystems a. 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.