What have a complete digestive system and a closed circulatory system?
viruses reptiles phytoplankton mammals bacteria graptolites humans elephants
A B C D E F G H
Because reptiles are vertebrates, they are chordates.
reptiles have a complete digestive system and a closed circulatory system
What have a complete digestive system and a closed circulatory system? (A) viruses (B) reptiles (C) phytoplankton (D) mammals (E) bacteria (F) graptolites (G) humans (H) elephants