The study of the interactions among organisms and their environment. Ecologists are scientists who study these relationships. Two groups of environmental.

•The study of the interactions among organisms and their environment.•Ecologists are scientists who study these relationships. •Two groups of environmental factors:•Abiotic•Biotic

•The nonliving things in an environment.•EXAMPLES•Water•Light•Temperature•Air•Soil

•Living things in an environment.•EXAMPLES•Animals•Humans•Plants•Cells

•Organism•One individual from a population.

•Population•One species that live in the same area.

•Community•Populations of different species.

•Ecosystem•All communities in an area and the abiotic factors.

•Biome•Large region with plants and animals adapted to soil and climate of region.

•Biosphere•Made up of all ecosystems on Earth.