Environmental Science
The formation of a climax community from an abandoned farm land is a an example of

Secondary succession
Autogenic succession
Allogenic succession
Primary succession

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

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