Environmental Science
Where cold surface air replaces warm air, the boundary separating the different bodies of air is:

A cold front
A parallel of latitude
A warm front
A tornado

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Environmental Science
The order of basic processes involved in succession is

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

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