The biotic parts of an ecosystem, also called biotic factors, are all of the living things in the ecosystem. These organisms must interact with each other, or they risk extinction.
The biotic factors of an ecosystem include primary producers, herbivores, carnivores, omnivores and detritivores. Primary producers are able to make their own food using chemical energy or energy from the sun. Plants and some types of bacteria are primary producers.
Herbivores are organisms that eat primary producers. Sheep and cows are classified as herbivores. Carnivores and omnivores both eat herbivores. Carnivores are called meat eaters because they eat animals. Omnivores eat both plants and animals.
Detritivores feed off of dead organisms as well as decaying organic matter. Earthworms are classified as detritivores. All of these organisms play an important role in the food web of an ecosystem.