Animals in thermostable environments do not need to use much energy for thermoregulation.
Animals living in thermostable environments do not need to use much energy for thermoregulation since they can rely on external sources like sunlight or water temperature to maintain their body heat. This differs from endothermic animals that regulate their temperature internally and require more energy for thermoregulation. So, the correct answer is B - do not need to use much energy for thermoregulation.
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