Environmental Science
Valuable, practical services that help to preserve ecosystem performed by nature are called

Ecosystem service
Biosphere balancing
The green house effect
Biological control

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Environmental Science
Which of the following statements is not correct?

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.
A change in the air temperature can change the relative humidity.
The length of human hair changes as the relative humidity changes.

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