Mollusks are invertebrates such as the common snail, and invertebrates are animals who lack a backbone or spinal column. Given these facts, what does an animal like a mollusk lack that many other animals have among the following options:
- sensory neurons
 - Energy.
 - Bodily water
 - kinetic energy
 - alveoli
 - the skin
 - an organism's body
 - spinal column


 

        spinal column 