Multiple choice

Which phyla of animals represent the cellular level of the body organization?

  1. Platyhelminthes

  2. Mollusca

  3. Coelenterata

  4. 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.