*31 Subhaanal lazee khalaqal azwaaja kullahaa mimmaa tumbitul ardu wa min anfusihim wa mimmaa laa ya`lamoon (36:36) Holy is He *30 Who created all things in pairs, whether it be of what the earth produces, and of themselves, and of what they do not know. Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi