Environmental Science
As the difference between the air temperature and the dew point increases, the relative humidity:

Remains constant at a value less than 100%
Increases
Remains constant and equal to 100%
Decreases

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Environmental Science
Definition of ecosystem is

The community of organisms together with the environment in which they live
A community of organisms interacting with one another
The part of the earth and its atmosphere which inhibits living organisms
The abiotic component of a habitat

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