Answers

2014-09-20T07:00:44+05:30
Metals like nickel, ferrum, zinc etc, release of chloro floro carbons into air by vehicles, chemical fertilizers, inorganic wastes like animal excreta, non degradable wastes like plastic etc.............
0
2014-09-20T16:25:47+05:30
metals like nickel, ferrum, zinc etc. added to our ecosystem
0