Environmental Science
The time of day when the relative humidity reaches a maximum value is usually

At the time when the air temperature is highest
Just before sunrise
About midnight
At the time when the air temperature is lowest
In the middle of the afternoon

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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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