By performing controlled experiment that are tested by gathering more data based on observations
A. Kidneys are the organs in the urinary system that produce urine after breaking it down from food.
The question is somewhat confusing. I would choose "none of the above" because none of the choices are blood vessels. However, the heart is the pump that moves blood through the network of blood vessels that distribute and collect materials throughout the body.
This is called Independent Assortment.<span />
