Ecology is the study of the relationships between biotic and abiotic factors in an environmental system. The Greek root eco means home, and the Greek suffix ology means to study.

An ecosystem includes all the abiotic and biotic factors in one particular environment. Click on each term below to learn more about the factors in an ecosystem.

All the biotic factors on Earth are organized into different levels of organization. Watch the following video to learn more about the various levels of ecological organization.

Complete the interactive below to review the ecological levels of organization.