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

Carbon dioxide
Ozone
Chlorofluorocarbons
Water vapor
Nitrous oxide

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Environmental Science
Mycorrhiza represents

Symbiotic association between a fungus and roots of higher plants
Parasitic association between a fungus and roots of plants
Parasitic association between a fungus and an alga
Symbiotic association between a fungus and liverworts

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