domingo, 5 de octubre de 2014

The Excretory-Urinary System

http://bcove.me/0n6bc6vq
We need nutrients (digestive system) and oxygen (respiratory system) to live. The circulatory system distributes nutrients and oxygen to different parts of our body and carries away waste substances... but... How do we get rid off these substances?... It's time to... PEEEEEEE!!!!

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