You are presented with the question "what have complete digestive systems?" and the following answer choices: 
- a fish
 - saliva
 - mammals
 - insects
 - protist
 - barnacles
 - reptiles
 - rabbit

Now knowing that chordates have a complete digestive system and a closed circulatory system and because reptiles are vertebrates, they are chordates, choose the best answer.


 

       reptiles  