Concept:Desert animals survive extreme heat mainly by avoiding it rather than resisting it.
Explanation:Adopting nocturnal habits allows desert animals to remain active during cooler night hours.
Burrowing helps them escape the intense daytime heat by staying underground.
Most desert animals do not adjust their internal body temperature; many are poikilothermic, so their body temperature varies with the environment.
Possessing many sweat pores would cause excessive water loss, which is disadvantageous in a desert.
Therefore, only I and II are valid adaptations.
Answer:Option C (I and II only).