Population percent change, 2010 to 2014, is derived by dividing the difference between the 2013 population estimate and the April 1, 2010 estimates base by the April 1, 2010 estimates base.
What is the main function in the excretory system? The main function of the excretory system is to get rid of wastes  from the body. It is actually composed of many different structures  and organs in other systems of the boâ¦dy. The organs that contribute  are ones like the lungs, skin, liver, kidneys, colon, and bladder,  just to name a few.
There are several organs that are involved in excreting wastes from the body. These organs include the lungs, livers, skin, and kidneys. The kidneys are the major excretory organs of the body and are part of the urinary system, which also has many other important functions. II. (formed when nucleic acids are broken down). The urinary system also regulates ion levels in the plasma by regulating the amount of sodium, potassium, chloride and other ions lost in the urine.