| Animal | Division of Labour |
| i. Pheretima ii. Fasciola iii. Spongilla iv. Obelia |
A. Organ level B. Cellular aggregate level C. Tissue level D. Organ system level |
| 1. | (i)-B, (ii)-C,(iii)-D and (iv)-A |
| 2. | (i)-B, (ii)-D,(iii)-C and (iv)-A |
| 3. | (i)-B, (ii)-D,(iii)-C and (iv)-A |
| 4. | (i)-A,(ii)-D,(iii)-C and (v)-B |
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