You are presented with the question "what have a complete digestive system and closed circulatory system?" and the following answer choices: 
- protist
 - sharks
 - cows
 - lizards
 - mammals
 - viruses
 - crocodiles
 - bacteria

Now knowing that chordates have a complete digestive system and a closed circulatory system and yep, lizards are chordates, just like humans, choose the best answer.


 

    lizards     