Nature        vWhether at the level of physiology,, neurology, psychology, nature has a way of providing what is required, how much, where, when, in what way, what for,

all towards accomplishing evolution towards highest level, including a providing enough scope and ability to manipulate and alter the provisions to a limited extent as per needs, convenience, or for innovation, improvisation, improvement, refining, towards a higher purpose, but individual specific, situation specific, some times uniformly , somewhere at random, the reason or justification for each cannot easily be discerned, yet nothing happens without a deeper significance