Monday
December 22, 2014

Homework Help: science is hardddd!!!!

Posted by PLEASEEEE on Thursday, January 24, 2013 at 7:48pm.

Can I Have An Example Of A Closed System??
Please use easy words that I can understand, Im not that smart and i'm only in 7th grade.

Also can you give me an example of an Open System??

Thank You.

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