In general, producers herbivores carnivores. Detritivores and parasites feast on them all. This refers to the ability to resist change. Lawns and corn fields are essentially monocultures, and are unstable. It takes a lot of work to maintain them.
Competition Occurs when there is limited resources shared by two species.
V. Habitat vs niche. Habitat is the physical place where a species lives. It includes both biological and physical components of the environment. Niche refers to the role and response of the species to the physical and biological habitat. Each occupies the same habitat.