Environmental Science
Which one is true?

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

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Environmental Science
Thermal belts are:

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

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