Fact 1: Adult sponges are sessile.

Fact 2: Most echinoderms are sessile or sedentary marine forms with radial symmetry as adults.

Given the two facts above, answer the question "What are sedentary?" with the following options: 
- barnacles
 - fish
 - fur seals
 - animals
 - adult sponges
 - chickens
 - gazelles
 - birds


 

     adult sponges    