Environmental Science
The species of plants that play a vital role in controlling the relative abundance of other species in a community are called

Pioneer species
Successional species
Edge species
Link species
Keystone species

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

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