species
A group of similar organisms that can breed and produce fertile offspring.
organism
an individual animal, plant, or single-celled life form.
community
All the different populations that live together in an area
ecosystem
A biological community of interacting organisms and their physical environment.
biosphere
part of Earth in which life exists including land, water, and air or atmosphere
biotic factor
Any living part of the environment with which an organism might interact
abiotic factor
A nonliving part of an organism's habitat.
resource
A substance in the environment that is useful to people, is economically and technologically feasible to access, and is socially acceptable to use.
ecology
Scientific study of interactions among organisms and between organisms and their environment
habitat
Place where an organism lives
population
A group of individuals that belong to the same species and live in the same area