Environmental Science
Thermal belts are:

Cold, below-freezing air found at the top of a mountain
Pockets of cold air resting on a valley floor at night
Pockets of warm air resting on a valley during the afternoon
Warmer hillsides that are less likely to experience freezing conditions

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Environmental Science
Which one is true?

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
symbiosis when the interaction is useful to both the populations

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