Chordates have a complete digestive system and a closed circulatory system.
All chordates are vertebrates.
Vertebrates have a complete digestive system and a closed circulatory system.
What do all vertebrates have?

  - sensory neurons
  - characteristics
  - a complete digestive system
  - Veins and arteries.
  - sub-units of species
  - wings and feathers
  - gills
  - gizzard