It is important for mammals to regulate their body temperature because they are endothermic.
An endothermic animal is one that is capable of generating and conserving heat internally so as to maintain a relatively warm body temperature to be able to carry out important physiological processes.
However, the environment of mammals is mostly variable as far as temperature is concerned. When the temperature of the environment becomes too hot or too cold, it affects the body temperature and the body must find a way to adjust so as to maintain the normal temperature of operation of physiological processes.
More on maintenance of homeostasis can be found here: https://brainly.com/question/6238886
