which of the following are endothermic tetrapod animals with backbones?
a fish alpacas birds toads animals sharks long bats
A B C D E F G H
Animals with backbones are called vertebrates.
Birds are endothermic tetrapod animals with backbones. 
which of the following are endothermic tetrapod animals with backbones? (A) a fish (B) alpacas (C) birds (D) toads (E) animals (F) sharks (G) long (H) bats