Answers

2014-07-27T16:55:21+05:30
WITHOUT SUCH A MECHANISM I THINK HUMANS WOULD NOT HAVE SUCH A SIGNIFICANCE . 
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i need clear explanation on topic
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2014-07-27T17:12:06+05:30
I APPRECIATE THE MECHANISM OF RESPIRATION IN  OUR BODY BECAUSE IT HELPS MY BODY TO KEEP FRESH AND HEALTHY . IT ALSO HELP ME TO LIVE IN EARTH

3 3 3
i need clear explanation on topic in 100 words