You are presented with the question "which of the following are endothermic tetrapod animals with backbones?" and the following answer choices: 
- a fish
 - alpacas
 - birds
 - toads
 - animals
 - sharks
 - long
 - bats

Now knowing that birds are endothermic tetrapod vertebrates and animals with backbones are called vertebrates, choose the best answer.


 

   birds      