Environmental Science
The gas that absorbs most of the harmful ultraviolet radiation in the stratosphere:

Chlorofluorocarbons
Water vapor
Nitrous oxide
Ozone
Carbon dioxide

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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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