How did life evolve? Not if monkeys and humans share some traits. How did the endocrine system evolve? Extremely precise. How did the digestive system evolve? How did the nervous system evolve? Voluntary and involuntary? How did the heart beat evolve as involuntary, but breathing is voluntary, yet when you sleep becomes involuntary. How did the cardio pulmonary system evolve? Skeletal and muscular systems? How and when did the 3 little bones evolve and connect directly to the brain? How did skin evolve, it's the largest organ in the body? How did consciousness evolve? And my favorite, Darwin said he shuddered to think what would happen to his theories on evolution if one "pondered the eye." So how did the eye evolve? How did sexual reproduction evolve from asexually reproducing single cell organisms? And don't neglect the fact that the human body is incredibly precise, don't believe me? Through your potassium levels out of whack and get back to me. Evolution? Not easily proven. All this from primordial ooze with some magical life producing spark to irreducible complexity with the mere passage of a handful of millions of years and happy accidents of mutation.