The study of the relationships among organisms and their environment.

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Ecology

Bio: -Life

A: -not​

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Biotic vs. Abiotic factors

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• Organism: an individual living thing

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• Population: a group of the same species that lives in one area

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• ​Community: a group of different species that live together in one area.

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Levels of organization in a healthy ecosystem (eschooltoday.com)t=

Levels of organization

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• Ecosystem: all of the organisms + nonliving things in a given area.

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• biome: a major regional or global community of organisms characterized by the climate conditions and plant communities that thrive there.

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Levels of organization

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Each color block is a biome

the assortment, or variety, of living things in an ecosystem.

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Biodiversity

a species that has an unusually large effect on its ecosystem

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keystone species

Keystone species form and maintain a complex web of life.

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One example of a keystone species is the beaver. Beavers cut down trees and build dams on rivers. This changes the ecosystem by turning a river into areas of ponds and marshes. Many different species can live in the pond and marsh environments that are made by beavers.

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