(October 13, 2017 at 9:07 pm)RayOfLight Wrote: How was nature able to "understand" or "determine" what a living being needed?
Get a closed container and half fill it with sand and pebbles of different sizes. Start shaking it, first quite vigorously and then progressively more gently until you are hardly shaking it at all. After a while you'll find that the smaller stones slip through the spaces in-between the larger stones, and the sand, made up of the smallest stones is at the bottom.
The container was not able to understand that the sand needed to be at the bottom, it was an undirected physical process that sorted the contents over time. Evolution is the same.