<h2>Because historical events, more likely, depend on memories.</h2>
Explanation:
Most of the time, historical events are attached to historians whom are able to right events according with their thinking process. So, this human-depending issue it makes it changeable, also information sources are from people that witness the event, and that has some ingredient of subjectiveness.
Offspring that benefited by inheriting several mutations out-competed the offspring lacking the mutations.So, the population changed and they grew the mutations to protect themselves
