Fact 1: Adult sponges are sessile.

Fact 2: Sessile Attached permanently, immobile.

Given the two facts above, answer the question "What are attached permanently?" with the following options: 
- Veins and arteries.
 - sensory neurons
 - barnacles
 - tadpoles
 - seahorses
 - alligators
 - adult sponges
 - an organism's body


 

       adult sponges  