All organs belong to an organ system.
ogan systems are made of organs, they are a group of organs woking together ofor 1 purpose btw i am in eith grade answering this
I am not entirely sure in what sense this question is meant; do you mean to ask which organ system is more important or more basic than any other, or which is most central to the mass of the body? In...
everything that is involved with processing the food just before excreting it and the organs that excrete it. (kidneys, bladder, large intestines etc)
The Bladder?