Environmental Science
The most important reason why summers in the Southern Hemisphere are not warmer than summers in the Northern Hemisphere is that:

The earth is closer to the sun in January
Over 80% of the Southern Hemisphere is covered with water
The earth is farther from the sun in July
The sun's energy is less intense in the Southern Hemisphere

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Environmental Science
The order of basic processes involved in succession is

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

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