| Body Structures | porifera, Amoeba (protozoa) |
| contractile vacuoles | Amoeba,paramecium and unicellular protists |
| Flame cells | phylum platyhelminthes |
| Nephridia | Annelids (earthworm) |
| Malphegian tubules | Insects (cockroach) |
| Green glands/ Antennal glands | prawns (crustaceans) |
| Sweat gland | man |
| salt gland | Sea birds,Sea reptiles |
| Kidney | animals which have spinal cord |
