The excretory system in mammals consists of the following parts except

The excretory system in mammals is responsible for removing waste and excess fluids from the body. It consists of several parts, including the kidneys, ureters, bladder, and urethra. The kidneys are two bean-shaped organs located on either side of the spine. They filter waste and excess fluids from the blood and produce urine, which is then transported to the bladder through two tubes called ureters. The bladder is a muscular sac that stores urine until it is ready to be expelled from the body. When the bladder is full, the urine is expelled through a single tube called the urethra. So, the correct answer to the question is "two bladders." Mammals have only one bladder, which is a part of their excretory system.