Vertebrate chordates have a backbone, and chordates Chordates Chordates include fish, amphibians, reptiles, birds, and mammals. Given these facts, fish, amphibians, reptiles, birds, and mammals have what among the following options:
- food
 - fur and fat
 - backbone
 - power
 - four limbs
 - retina
 - vision
 - competition


 

   backbone      