Question
Match the following list of animals with their level of organization and choose the correct sequence:
| Column I | Column II |
| (A) Organ level | (P) Pheretima |
| (B) Cellular aggregate level | (Q) Fasciola |
| (C) Tissue level | (R) Spongilla |
| (D) Organ system level | (S) Obelia 1 |