Final answer:
Thermoregulation is the process by which organisms maintain a constant body temperature. They have adaptations to cope with changes in environmental temperature, such as body structures and methods to shed excess heat.
Step-by-step explanation:
Thermoregulation is the process by which organisms maintain a constant body temperature. It is essential for organisms to maintain a constant body temperature because the rate of metabolic processes increases at very high or low temperatures. Organisms have adaptations to cope with changes in environmental temperature. For example, in cold climates, organisms have body structures such as fur, feathers, blubber, and fat that help them withstand low temperatures and conserve body heat. In hot climates, organisms have methods like perspiration in humans or panting in dogs to shed excess body heat.