Answers

2015-07-15T20:21:56+08:00
 A Mixture is material system that made up of two or more different substance.
Substance is the real physical matters of which a person or thing consists and which has a tangible and solid presence.

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2015-07-15T20:26:55+08:00
Can be a particular kind of matter or material 
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mixture is a combination of two or more substances it doesn't have a fixed composition