Chordates have a complete digestive system and a closed circulatory system, and vertebrates have a closed circulatory system. Given these facts, what group of animals do chordates belong to among the following options:
- graptolites
 - more abundant
 - warm-blooded
 - four limbs
 - epidermal
 - Vertebrates
 - animals
 - insects


 

      Vertebrates   