You are presented with the question "What does an adult sponge have?" and the following answer choices: 
- gills
 - Length
 - polyps
 - Energy.
 - alveoli
 - a cuticle
 - retina
 - Energy

Now knowing that adult sponges are sessile and polyps can be peduncular or sessile, and are usually viral in origin, choose the best answer.


 

   polyps      