Fact 1: Chordates have a complete digestive system and a closed circulatory system.

Fact 2: Vertebrates have a closed circulatory system.

Given the two facts above, answer the question "What group of animals do chordates belong to?" with the following options: 
- graptolites
 - more abundant
 - warm-blooded
 - four limbs
 - epidermal
 - Vertebrates
 - animals
 - insects


 

      Vertebrates   