GRE Reading Comprehension: JiJing 352-GRE阅读机经352篇 - 47YIPG5MZN03GGX3J

According to the passage, Farmer concedes that endothermy provides an explanation for which of the following features shared by birds and mammals? A. The ability to forage B. The ability to sustain exercise C. The instinct to care for offspring D. Flexibility in habitat usage E. Body insulation