Question Detail
Question
Which mammalian feature allows sustained high activity levels compared to reptiles?
Correct Answer
Option C is the correct answer.
Detailed Explanation
Complete separation of oxygenated and deoxygenated blood in a four-chambered heart supports high metabolic rate, while endothermy allows sustained activity independent of environmental temperature.
Hint
Reptiles have three-chambered hearts and are ectotherms.