Answers

2015-11-13T00:09:27+05:30
We can hear SOUND but can't see it.
1 5 1
2015-11-13T00:10:15+05:30

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I guess the answer is voice or sound. Hope it helps and pls mark as the best answer. :-)
1 5 1
:P voice is also created by sound na
Yup..thatz y I told voice OR sound..!! :)