So have you seen the genetic change you speak of in humans so they can speak languages enabling them to pass on their background and history, whereas chimpanzees and fish apparently do not pass on these histories?
It sounds like you are confusing evolution of languages with evolutionary biology. They are not one and the same.
Evolution (referring to evolutionary biology) is study of change, where any inheritable traits are passed on future generations of descendants. The working process involved genetics.
Languages do change over times, as well as being influenced by languages outside of it.
What I mean by the later about “being influenced by” other languages. Take for instance, modern English for example, evolved from Middle English (c 1100 to c 1500), but Middle English were influenced by others languages such Norman (French) from Old French dialect from Normandy, some Old Norse because of Danish and Norwegian Vikings have settled in parts of England before the Norman Conquest (1066), and from Latin, which was universal language of Roman Catholic Church in Western Europe. Loanwords, are words borrowed from other (foreign) languages, that have become everyday words to modern English.
A lot of our scientific vocabulary make use of Latin and Greek for scientific terminology.
But I am digressing.
My point is that languages are not biological and not genetically inherited. We don’t genetically speak English. English isn’t encoded in our genes or in our DNA.
Language is something that we have learned and trained to use, like from our parents and in schools.
The evolution of languages and evolution in biology are not the same. We can be taught languages, but languages cannot be inherited via our chromosomes, our genes or our DNA.