Please excuse the poor grammar, English isn't my first language. For #3, this rule always fascinated/confused me the most. How did us humans (animals formed fro

Please excuse the poor grammar, English isn't my first language. For #3, this rule always fascinated/confused me the most. How did us humans (animals formed from evolution/survival of the fittest) create these abstract 'rules' or fictions we all just collectively follow. Was there some sort of cumulation of ideas of the past woven into novel ones to make an archetypal epoch? Any insight/book recommendation to bridge this knowledge gap is much appreciated.