Asconoid
Asconoid sponges are the most primitive and simplistic in structure of sponges. They have radial symmetry, and they are tube shaped.
Sponges do not have circulatory systems, instead the water flow system takes care of this. Sponge cells absorve oxygen from the water flowing through the cell. Then waste products diffuse out of the cell.
Sponges do not have circulatory systems, instead the water flow system takes care of this. Sponge cells absorve oxygen from the water flowing through the cell. Then waste products diffuse out of the cell.