| Flap that covers and protects gills | | |
| Gas exchange; removes nitrogen waste; osmoregulation | | |
| Collects nitrogen waste from blood and makes urine; osmoregulation | | |
| Makes bile, stores vitamins, breaks down toxins | | |
| Pouches containing bacteria that break down plant material (cellulose) | | |
| Finishes digestion, absorbs nutrients, concentrates digestive waste | | |
| Exit shared by excretory and reproductive systems | | |
| Exit used by the digestive system | | |
| Makes acid & digestive enzymes to start the break down of food | | |
| Produces, stores, and recycles blood cells; | | |
| Controls buoyancy | | |
| Makes trypsin, insulin, & glucagon | | |
| Increase surface area inside intestine | | |
| Stores bile | | |