Environmental Science
The largest annual ranges of temperatures are found:

At the Equator
In the Northern Central Plains of the United States
At polar latitudes over land
At middle latitudes near large bodies of water
At polar latitudes over water

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Environmental Science
Which one is true?

symbiosis when the interaction is useful to both the populations
commensalism when none of the interacting populations affect each other
symbiosis when neither population affects each other
commensalism when the interaction is useful to both the populations

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