Final answer:
The statement that terrestrial animals face more radical thermal changes than aquatic animals is true due to the low heat capacity of air and minimal buffering of temperature fluctuations in terrestrial environments.
Step-by-step explanation:
This statement is true. Terrestrial habitats are characterized by a fluid (air) that absorbs very little heat energy and has a low heat capacity, leading to minimal buffering of temperature fluctuations. Measurements of environmental temperature show that terrestrial systems are much more dynamic in time and space than most aquatic systems. In contrast, aquatic organisms live in an environment where water's thermal properties buffer temperature fluctuations, providing a more stable environment in terms of temperature.
Energy requirements related to the environment differ significantly between terrestrial and aquatic animals. For instance, terrestrial animals may experience torpor or hibernation to adapt to extremes of temperature. Ectothermic animals, like some reptiles, alter their behavior, seeking cooler areas or basking on warm rocks to regulate their body temperature. Conversely, aquatic animals do not often have to endure such extremes.