You are presented with the question "What has a complete digestive system and a closed circulatory system?" and the following answer choices: 
- graptolites
 - Veins and arteries.
 - sunlight
 - graphite
 - fur seals
 - viruses
 - animals with jaws
 - Most plants

Now knowing that chordates have a complete digestive system and a closed circulatory system and all chordates have jaws, choose the best answer.


 

       animals with jaws  