If you are scare of spider and you kill them, probably if a spider is very aggressive you won't kill it and you will go away leaving it alive.
Then the aggressive spider will survive and will reproduce giving the gen of this aggressive behavior to its descendent.
The pacific spider gen will disappear and repeating the process over the year you will get only aggressive spiders.
That is gen evolution adapted to survive.
The same process can be extended to human beings. If in a war the pacific peop…
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