How does the environment affect body temperature?
It places an external load on the body’s temperature regulating mechanisms.
The temperature and humidity of the environment affect body temperatures by requiring additional heating or cooling of a body to maintain a temperature suitable to the required cellular processes and life.
Exceeding either the upper temperature limit (108’F) or less than the lower limit (95’F) will lead to death in humans.
Cold temperatures require heat generation from muscles to maintain a normal body temperature, and hot temperatures require cooling through sweat evaporation. The temperature limits will be different for different species.