Final answer:
The body maintains homeostasis at elevated temperatures mainly through sweating and vasodilation, part of a negative-feedback loop.
Step-by-step explanation:
The body maintains homeostasis when its inner temperature becomes higher than the normal body temperature primarily through the mechanism of sweating. When the body temperature rises, the nervous system triggers sweat glands to release sweat, which evaporates and cools the body down.
In addition, blood vessels in the skin widen, a process known as vasodilation, allowing for increased blood flow to the skin which helps dissipate heat into the environment. These responses are part of a negative-feedback loop to bring the body temperature back to a stable level.
Shivering and goosebumps are other mechanisms, but they function to increase body temperature when it is too low, not reduce it when it is too high. Hence, for the mechanism for maintaining homeostasis in elevated body temperature, sweating is the correct answer (b).