Let's think step by step! Birds are vertebrate endotherms with what?\nOptions:\n- (A) fat\n- (B) Energy\n- (C) legs\n- (D) like some sharks\n- (E) Tail\n- (F) invertebrates\n- (G) arms\n- (H) four
The thinking starts now:
User
Birds are endothermic tetrapod vertebrates. Legs define Tetrapods. Birds are vertebrate endotherms with legs. The final answer: (C).
Assistant