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.
The urinary system is an organ system that is responsible for extracting waste components from the blood and expelling them from the body. It is one (1) of four (4) organ systems that are responsible for excretion. Excretion is simply a process by which the body gets rid of waste materials, such as urine, faeces, excess water and carbon dioxide. The other three organ systems responsible for excretion are the respiratory system, the digestive system and the integumentary system.