Ok, let's talk evolution.
Obviously entities are capable of adaptation; it has been documented at a genetic level and observed by, likely, everyone on this planet; but, how can something as complicated as a human, for example, possibly evolve in the way we are taught that evolution works? (<-- that's a big sentence)
Note - I use the word taught because it is possible that my understanding of evolution is limited to my teachings (meaning I probably don't know everything).
As far as I know every system/organ in our bodies relies on one or more other systems/organs. How can individual gene mutations cause such imense complexity?