The correct options are
A Liver
B Stomach
C Intestine
In addition to the urinary system, the skin, lungs and liver of vertebrates are accessory excretory organs. Skin: Human skin possesses glands for secreting two fluids on its surface, namely sweat from the sweat glands and sebum from sebaceous glands. The lungs play in the excretory system is to dispose of carbon dioxide through exhalation. The liver is the largest gland in vertebrates. Urea is formed in the liver ornithine cycle. Ammonia - toxic substance - is quickly changed into urea in the liver and hence eliminated from the body.