Environmental Science
Which one is true?

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

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Environmental Science
Frost forms when:

Objects on the ground cool below the dew point temperature.
The dew point is 32oF or below.
Water vapor changes into ice without first becoming a liquid.
All of these

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