Environmental Science
One greenhouse gas contributes 14% to total global warming and another contributes 6%. These are respectively identified as

Methane and CFCs
CFCs and N2O
Methane and CO2
N2O and CO2
CFCs and CO2

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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
Symbiotic association between a fungus and liverworts
Parasitic association between a fungus and an alga

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