a: excretory system ~
b: sewage system
What:
A sewage system removes waste products from a city. The excretory system removes waste products from the body. This analogy is quite common,' cause most people can understand it. But then again, most people have a day in day out understanding of the human excretory system also.
Useful?
Writer: Lecrezia
LCC:
Where: Reference Link Has Evaporated
Date: May 15 2014 6:29 PM
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