Final answer:
The statement regarding thermoregulators is false; endotherms maintain a stable internal temperature through physiological mechanisms regardless of environmental changes, while ectotherms have body temperatures that vary with the environment, utilizing behaviors to regulate their temperature.
Step-by-step explanation:
The statement about thermoregulators' internal temperatures is false. Endotherms are animals that maintain a relatively constant internal body temperature regardless of environmental temperatures. This is achieved through metabolic heat production and other physiological mechanisms. Examples of endotherms include mammals and birds. On the other hand, ectotherms have body temperatures that are influenced by their surroundings. Their body temperature changes with the environmental temperature, although they may use behaviors such as basking in the sun or seeking shade to regulate it.
Homeostasis is the ability of an organism to maintain constant internal conditions, and is a critical aspect of endothermy. Ectotherms rely on external environmental factors to regulate their body temperature, which puts them at a disadvantage in rapidly changing temperatures. However, ectotherms are typically more energy-efficient than endotherms as maintaining a constant temperature requires more energy and food.