| 1. | Catching food and digesting it |
| 2. | Exchange of gases |
| 3. | Excretion and Osmoregulation |
| 4. | Regeneration of lost body parts |
| A | B | C | |
| 1 | Pseudocoelomate | Acoelmate | Eucoelomate |
| 2 | Acoelmate | Pseudocoelomate | Acoelmate |
| 3 | Acoelmate | Pseudocoelomate | Eucoelomate |
| 4 | Acoelomate | Pseudocoelomate | Pseudocoelomate |