Complex Life and Complex Machines

The compexity of living things is used to argue that only God could create them. Maybe it is true. However, we notice Nature has some tricks and short-cuts. Among mammals Nature mostly does not invent new structures but modifies existing ones. Horn is made up of hair. Mammals have feet and hands that have 5 digits. Hooves and paws can be shown to be a modification of 5 digits even though they appear so different.  Heart, lungs, eyes and so forth are "standard equipment". Bilateral symmetry is common throughout the animal kingdom. So the variation and complexity have evolved over time by repeating or modifying basic structures. Even some behavior can be shown to be imprinted into the brain at birth by the genetic code.  Simple creatues such as microbes or insects behave in a total pre-programmed way. They are like robots using DNA as a computer program.

Machines can be complex also. The computer you are using to read this is too complex for any one person to grasp all the activity going on inside these machines. Transistors were invented by Physicists based on behavior of atomic structure. Micro circuit experts design billions of transistors into a functional device. With the help of chemists, imaging experts and complex machines the circuits can be "repeated" to produce thousands of parts economically. Software experts write millions of lines of instuctions for the finished computer. Software often uses repeating patterns of pre-designed routines just as nature repeats structures. Software on your computer is so complex it has to be broken into smaller pieces so experts can deal with pieces rather than the whole. It is the old method for dealing with complexity...break the task down into small  pieces one man can deal with.