Which of the following statements is true regarding snakes?

The statement that snakes must regulate their body temperature is correct because snakes are ectothermic, meaning they rely on external sources of heat to maintain their body temperature. Unlike endothermic animals, which generate their own heat internally, snakes depend on environmental conditions to keep themselves warm, regulating their body temperature through behaviors like basking in the sun or seeking shade. This temperature regulation is crucial for their metabolic processes, activity levels, and overall survival.

The other statements about snakes contain inaccuracies. For example, not all snakes are venomous; many species exist that are non-venomous. Additionally, snakes cannot survive in arctic climates where temperatures are consistently low and would not provide the necessary warmth for their ectothermic physiology. Lastly, since they are ectothermic, they do require heat regulation; however, this requirement contradicts the idea that they do not need it, reinforcing the correctness of the answer related to temperature regulation.