This is a regulation of the internal enviorment of an organism

The regulation of an organism's internal environment to maintain conditions suitable for life is called homeostasis.

  The regulation of an organism's internal environment to maintain conditions suitable for life is called homeostasis. ... Mechanisms of homeostasis enable organisms to regulate their internal environment, despite changes in their external environment.

Explanation:

relative humidity, temperature and dew point -- are bound together in the mathematical relationship below. relative humidity changes when temperatures change. because warm air can hold more water vapor than cool air, relative humidity falls when the temperature rises if no moisture is added to the air. so i would say a