Hello, you see Nature has already done a thing long back which we struggle to understand yet. Providing two eyes for 3D vision to avoid obstacles while moving, providing two ears for stereo audio to know the direction of incoming sound do have methods in adjusting particular portions of dna that evolves embryonic stem cells at particular portion of embryo into developing into eyes or ears which are methods of doing it but, how does Nature decide the purpose of doing it is astounding which I really don’t know and, that is my question.