Which organ is part of the digestive system?

. The colon removes water and some nutrients and electrolytes from partially digested food. The remaining material, solid waste called stool, moves through the colon, is stored in the rectum, and leaves the body through the anus. The colon is part of the digestive system.
. The larynx is the upper opening into the windpipe (trachea), the passageway to the lungs. It's a part of respiratory system. 
. The trachea is often called the windpipe. It's a part of respiratory system. 
. The urine travels from the kidneys to the bladder in two thin tubes called ureters. It's a part of excretory system.