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

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
The earth is closer to the sun in January

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Environmental Science
The order of succession in a hydrosere is

Rooted aquatic plants-> phytoplankton->Free floating stage-> Sedge Meadow stage-> Reed swamp stage-> wood land stage-> Climax forest
Rooted aquatic plants-> phytoplankton->Free floating stage->Reed swamp stage->Sedge Meadow stage-> wood land stage-> Climax forest
phytoplankton->Rooted aquatic plants->Free floating stage->Reed swamp stage-> wood land stage-> Sedge Meadow stage-> Climax forest
phytoplankton->Rooted aquatic plants->Free floating stage->Reed swamp stage->Sedge Meadow stage-> wood land stage-> Climax forest

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Environmental Science
The earth is tilted at an angle of 23.5o with respect to the plane of its orbit around the sun. If the amount of tilt were increased to 40o, we would expect in middle latitudes:

Cooler summers and milder winters than at present
Hotter summers and colder winters than at present
Hotter summers and milder winters than at present
No appreciable change from present conditions
Cooler summers and colder winters than at present

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