"Environment does indeed play a role in genetic variation (height is 80% inherited through the genes and yet a consistent diet over a few generations can lead to huge changes in average height across a population) as genetic expression depends on environment.


Life is a dynamic entity. It changes and adapts. We humans change over time. For example, our deep understanding intellectual capabilities have on average been growing over the last century however our reaction speeds have on average been slowing down and some researchers have noted there does seem to be an inverse link between being able to comprehend complex concepts and being able to think quickly. Humans seem to have lost some speed to gain complexity. This is especially pronounced when we compare ourselves to other primates. Chimp rapid pattern recognition capabilities far outstrip our own but no chimp is ever going to understand quantum mechanics."