Which one of these is not a characteristic feature of sponges?
Cellular level of organisation
Presence of ostia
Body supported with cuticle
Intracellular digestion
In sponges, the body is supported by spicules made of calcium or silica or proteinaceous spongin fibres, but not cuticle.
The animals which are exclusively aquatic, sessile, with cellular level of organisation of the body are placed in phylum _____