value analysis and value engg is done nicely in nature's products

highly integrated design, all systems digestive, eliminative, breathing----nicely packaged, covered with a skin outside, smooth, soft, good looking

economical,..works with minimum inputs of food air water

easy to manufacture---thru womb

self repairing--healing

automated with energy packed

can also complain /suggest to its creator the god inside

nature is a very good engineer