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

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

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Environmental Science
The order of basic processes involved in succession is

Nudation->stabilization-> competition and co action->Invasion>reaction
Invasion-> Nudation->competition and co action->Reaction>stabilization
Invasion->stabilization-> competition and co action->Reaction>nudation
Nudation->Invasion-> competition and co action->reaction>stabilization

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