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A relationship between two different species.


symbiotic relationship in which both species benefit from the relationship


symbiotic relationship in which one member of the association benefits and the other is neither helped nor harmed


the relation between two different kinds of organisms in which one receives benefits from the other by causing damage to it (usually not fatal damage)


scientific study of interactions among organisms and between organisms and their environment


organism's role, or job, in its habitat


any animal that lives by preying on other animals


animal hunted or caught for food


an organism that makes its own food


an organism that obtains energy by feeding on other organisms


group of ecosystems that have the same climate and dominant communities


a vast treeless plain in the arctic regions between the ice cap and the tree line


the largest terrestrial biome dominated by evergreen trees.

temperate forest

mild tempatured forest that are dominated by non-evergreen trees

tropical rain forest

biome near the equator with warm temperatures, wet weather, and lush plant growth


an arid region with little or no vegetation


a system formed by the interaction of a community of organisms with their physical environment


the regions of the surface and atmosphere of the Earth (or other planet) where living organisms exist

Carrying Capacity

largest number of individuals of a population that a environment can support

Abiotic factor

physical, or nonliving, factor that shapes an ecosystem

biotic factor

biological influence on organisms within an ecosystem, a living part of an ecosystem


Organisms that break down the dead remains of other organisms


an organism that eats both plants and animals.


the type of environment in which an organism or group normally lives or occurs

limiting factor

any biotic or abiotic factor that restricts the existence, numbers, reproduction, or distribution of organisms.

food web

series of steps in an ecosystem in which organisms transfer energy by eating and being eaten

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