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    				| 1. | Show evolution of excreatory system with example | 
| Answer» Answer: As multi-cellular systems evolved to have organ systems that divided the metabolic needs of the body, INDIVIDUAL organs evolved to perform the excretory function. Planaria are flatworms that live in fresh WATER. Their excretory SYSTEM consists of two tubules CONNECTED to a highly branched duct system The principal organs of the excretory system are the kidneys, ureters, urethra, and urinary BLADDER. | |