Critter Curriculum vtfishandwildlife.com
Habitat: A place where a plant or animal lives. A place where an organism lives. Habitat is generally thought of in terms of single species such as bear or calypso orchid habitat.

Ecosystem: A complex array of organisms, their natural environment, the interactions between them, and the ecological processes that sustain the system. Ecosystems can be defined at any scale, from rotting logs, to Lake Champlain, to the Green Mountains.
Natural communities are an assemblage of plants and animals that are found recurring across a specific landscape under similar environmental conditions where natural processes, rather than human disturbances, prevail.