user818: I have asked two questions related to hearing and missed human-ear and  sound, I accept that sound would be more like physics but human ear or ear should be there.

user69: Being used already we have eyes and vision so I guess the matching set would be ears and hearing - just used with appropriate zoology/human-biology tags.

818: <p>I have asked two questions related to hearing and missed <a href="https://biology.stackexchange.com/questions/tagged/human-ear" class="post-tag" title="show questions tagged &#39;human-ear&#39;" rel="tag">human-ear</a> and  <a href="https://biology.stackexchange.com/questions/tagged/sound" class="post-tag" title="show questions tagged &#39;sound&#39;" rel="tag">sound</a>, I accept that sound would be more like physics but human ear or ear should be there.</p>
 69: <p>Being used already we have <a href="https://biology.stackexchange.com/questions/tagged/eyes" class="post-tag" title="show questions tagged &#39;eyes&#39;" rel="tag">eyes</a> and <a href="https://biology.stackexchange.com/questions/tagged/vision" class="post-tag" title="show questions tagged &#39;vision&#39;" rel="tag">vision</a> so I guess the matching set would be <a href="https://biology.stackexchange.com/questions/tagged/ears" class="post-tag" title="show questions tagged &#39;ears&#39;" rel="tag">ears</a> and <a href="https://biology.stackexchange.com/questions/tagged/hearing" class="post-tag" title="show questions tagged &#39;hearing&#39;" rel="tag">hearing</a> - just used with appropriate zoology/human-biology tags.</p>
