Man made things cause more pollution than natural things.
natural things have more life span than man made things.
man made thins are giving more facilities
but still natural one is greater because it has its own specialities.

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man made things                                    natural things
→things made by men                             →things found naturally
→cause a lot of pollution                          →cause less pollution
→composed of compounds                      →composed known exact
made in nature                                            origin,knife                                      eg.plants,humans
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