Final answer:
Homeotherms can cool off through vasodilation, sweating, and panting.
Step-by-step explanation:
When homeotherms are too hot, they can cool off through a process called thermoregulation. This can involve several mechanisms, including vasodilation, sweating, and panting. Vasodilation refers to the widening of blood vessels near the skin, allowing for increased blood flow and heat transfer to the surface of the body. Sweating involves the release of moisture from sweat glands, which evaporates and cools the body. Panting is a behavior observed in some animals, such as dogs, where rapid breathing helps to dissipate heat.
All of the above options, vasodilation, sweating, and panting, can be used by homeotherms to cool off when they are too hot. Different homeotherms may rely on different combinations of these mechanisms depending on their physiology and environmental conditions.