Answers

2015-03-04T12:19:00+05:30
Sweat
Faecal matter
Urine
urea(to a very limited extent)
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2015-03-04T12:25:49+05:30
Four substances that have to be excreted from the body are Carbon dioxide, urea, uric acid,excess water and salt in the form of sweat
 
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