You are presented with the question "Fish are aquatic animals that do not lack a what?" and the following answer choices: 
- the body's largest organ
 - furry hide
 - vertebral column
 - critical organs
 - thumbs
 - aqua lungs
 - salt and water.
 - Chlorophyll

Now knowing that invertebrates are animals that lack a vertebral column, or backbone and fish are backboned aquatic animals, choose the best answer.


 

   vertebral column      