Birds are vertebrate endotherms with what?
Options:
- (A) fat
- (B) Energy
- (C) legs
- (D) like some sharks
- (E) Tail
- (F) invertebrates
- (G) arms
- (H) four OK. Let's think hard:
Birds are endothermic tetrapod vertebrates. Legs define Tetrapods. Birds are vertebrate endotherms with legs.
So, the final answer is (C).