Multiple choice Which phyla of animals represent the cellular level of the body organization? Platyhelminthes Mollusca Coelenterata Porifera Reveal answer Fill a bubble to check yourself D Correct answer Explanation Porifera (sponges) show cellular level of organization with loose cell aggregates. Platyhelminthes, Mollusca, and Coelenterata have tissue level of organization, while higher phyla have organ-system level.