The human excretory system consists of kidneys, ureters, a bladder and urethra.
Stomach, ulna, radius.
Lungs, skin, large intestine, and kidneys.
Amoeba are not usually found in any organ unless there is an infection like amoebic dysentery. Amoeba are unicellular organisms that may cause infection in humans and animals.
The Skeletal System is an organ itself. There are no organs in this system.