Where do adult sponges attach themselves?
animal stalk Sediment coastlines plant substrate ocean water loose soil
A B C D E F G H
Hydras are sessile, attaching to some sort of substrate.
Adult sponges attach to a substrate
Where do adult sponges attach themselves? (A) animal (B) stalk (C) Sediment (D) coastlines (E) plant (F) substrate (G) ocean water (H) loose soil