Environmental Science
Definition of ecosystem is

A community of organisms interacting with one another
The part of the earth and its atmosphere which inhibits living organisms
The community of organisms together with the environment in which they live
The abiotic component of a habitat

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Environmental Science
The atmospheric greenhouse effect is produced mainly by the:

Absorption and re-emission of infrared radiation by the atmosphere
Absorption and re-emission of visible light by the ground
Absorption and re-emission of ultraviolet radiation by the atmosphere
Absorption and re-emission of visible light by the atmosphere
Absorption and re-emission of visible light by clouds

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