| Excretion |
The getting rid of waste products of metabolism |
| Homeostasis |
Maintaining a constant internal environment |
| Ectotherm |
Animals whose body temperature varies with the environmental temperature – do not generate their own body heat |
| Endotherm |
(An animal that) produces its (own) body heat or (body) temperatureindependent of (temperature of) environment |
| Reabsorption |
When soluble molecules return to the bloodstream again |
| Ureter |
[Tube which carries liquid] from kidney to bladder |
| Urethra |
[Tube which carries liquid] from bladder to outside |