What you refer to as evolution here I simply see as adaptation of the body system to the environment
What is adaptation; if not a process of evolution that makes an organism to be fitted to it's environment?
For example, the feet of the ancient ancestors of the Homo sapiens were Prehensile, because they needed them to grasp tree branches.
But as the need for climbing became less, the foot became flatter to adapt more to walking on the ground. And these adaptive features were passed on to subsequent generations. Isn't that evolution?
These are just theories though
Because something is theorized doesn't equate it to being fictitious.
Yeah I know; none of us lived through time as to witness the evolutionary processes. But there are paleoanthropological evidences to substantiate the theories