Environmental Science
Frost forms when:

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

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Environmental Science
Which one is true?

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

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