Environmental Science
When the air temperature is below freezing, the saturation vapour pressure over water is .

Equal to zero
Equal to the saturation vapour pressure over ice
Greater than the saturation vapour pressure over ice
Less than the saturation vapour pressure over ice

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Environmental Science
Which one is true?

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

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Environmental Science
The lag in daily temperature refers to the time lag between the:

Time of minimum temperature and the time of maximum solar radiation
Minimum and maximum temperature for a day
Sunrise and sunset
Time of maximum solar radiation and the time of maximum temperature
Minimum and maximum solar energy received at the surface for a given day

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