Final answer:
Thermoconformers can include both ectotherms and certain endotherms, particularly those that allow their body temperature to vary with environmental conditions, like hibernating mammals.
Step-by-step explanation:
False, thermoconformers are not only ectotherms. While it is true that many thermoconformers are ectotherms, which use external heat to regulate their body temperatures, the concept of thermoconforming is not exclusive to them. Thermoconformers refer to organisms that do not regulate their internal body temperature and instead have a body temperature that conforms to their environment. This can also include some endotherms that can allow their body temperature to vary with environmental conditions, such as certain hibernating mammals.