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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Environmental Science
Biogas is composed of

carbon dioxide, nitrogen and hydrogen
methane, carbon dioxide, nitrogen and hydrogen
ethane, carbon dioxide, nitrogen and hydrogen
methane, carbon dioxide, nitrogen and sulphur

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