They allow less blood to flow through the skin and conserve the core body temperature.
Explanation:Vasoconstriction happens when smooth muscles of blood vessels walls tighten making the blood vessels opening smaller.When blood vessels constrict less blood flows near the skin surface thus helps in conserving the body temperature. The human body maintains the temperature that enzymes work best at thus the vasoconstriction process has to take place to make sure that the body temperature is constant since enzymes work best at an optimum temperature.
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