If fins nearly as long as the rest of the body can be used to move through water, then fins nearly as long as what can be used to move through water?

Answer choices:
- most cephalopods
 - the rest of the body
 - animals with backbones
 - the eye of a needle
 - an organism's body
 - increases a body's strength
 - the body of water
 - the body of space

 

  the rest of the body        