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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