| A | B |
|---|
| porifera | wastes carried by amebocytes from cells |
| cnidaria | wastes pass through single opening |
| platyhelminthes | specialized excretory cells in free-living species |
| nematoda | ammonia diffuses through the body wall |
| mollusca | wastes eliminated by nephridia (long tubule) |
| annelida | wastes eliminated by nephridia |
| arthropoda | wastes eliminated by nephridium (nephridia) |
| echinodermata | wastes diffuse out of the body |
