because its help to lisning... this is a gift of allah...
Answer:
Try listening to something with one ear plugged.
The slight difference in a sound's time of arrival at our ears gives us a very
reliable indication of the direction from us to the source. This was very useful
to our ancestors, as it not only informed them of when a hostile neighbor or a
sabre-tooth tiger was attacking, but also from whch direction, thus providing
a strong suggestion regarding which way to run. The ancestors who had this
information lived longer and had more children than the mono-eared ones, who
sought escape in random directions, and the matched set of ears slowly but
certainly emerged as the prevailing style.
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In the book of James in verses 1:19-20 he tells us that we are to be quick to listen with our two ears and slow to speak with our one mouth. We are also told that we should be slow to anger.
Answer #2:
Because hearing in stereo gives a survival advantage. Having to listen to people TALK in stereo would be maddening. Mono is, all to often, more than enough.
Answer:
The mouth is composed of "two lips" that work as "one" for its function.