Answers

2015-12-16T20:02:57+05:30
The food we eat everyday is the source which creates waste substances in our body. The waste is produced in the rectum of the large intestine. 
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& the source is???
whats the source...?
u there...
now clear
i edited the answer
2015-12-16T21:29:28+05:30
Exactly, all those things in the food ,that we eat everyday, which are not required by the body are considered as waste
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