Match the entries in Column I and Column II.
| Column I | |
| Column II | |
| P. Euglena | 1. Connecting link between Annelida and Arthropoda |
| Q. Proterospongia | 2. Connecting link between Mollusca and Annelida |
| R. Neopilina | 3. Connecting link between Protozoa and Porifera |
| S. Peripatus | 4. Connecting link between plants and animals |
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