Excretory+System

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So what is the excretory system?
==The **excretory system** is a biological system that removes excess, unnecessary or dangerous materials from an organism. It is responsible for the elimination of oxygen waste products of metabolism as well as other nitrogenous materials.==

SO MUCH GLEE!


2 complex subjects: Malcom X and T-Rex. But they’re just rejects, Without Mr. X









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Sources:  [|http://www.biology4kids.com/files/cell_lysosome.html] [] [] [] [] [] [] [] [] [] []  [] (for the picture of the structure of urea, not for information) [] (for picture of urination) [|http://www.xtranormal.com] The Princeton Review's AP Biology Prep Book, 2010 Edition Campbell Biology, Fifth Edition