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

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Environmental Science
Our seasons are caused by:

The changing distance between the earth and the sun
Only (b) and (c) are correct
The angle at which sunlight reaches the earth
The length of the daylight hours
All of these

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