You are presented with the question "Vertebrate chordates have what part of the skeletal system?" and the following answer choices: 
- spinal column
 - hard bones
 - aerobic capacity
 - cartilage bones
 - critical organs
 - joints
 - fur and fat
 - graptolites

Now knowing that vertebrate chordates have a backbone and invertebrates are animals who lack a backbone or spinal column, choose the best answer.


 

 spinal column        