Environmental Science
An association between two individuals or populations where both are benefitted and where neither can survive without the other is

protocoperation
competition
mutualism
commensalism

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Environmental Science
Which of the following statements is not correct?

The length of human hair changes as the relative humidity changes.
A change in the air temperature can change the relative humidity.
The relative humidity is a measure of the air's actual water vapor content.
During the winter, low relative humidity can irritate the mucus membranes in the nose and throat.

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