You are presented with the question "What is true of all adult sponges?" and the following answer choices: 
- they are immobile.
 - at or near the margins
 - They may not survive.
 - water conservation
 - Light passing through water
 - competition
 - To keep their body heat.
 - permineralization

Now knowing that adult sponges are sessile and sessile Attached permanently, immobile, choose the best answer.


 

 they are immobile.        