Historical Evolution of Phonology

Language changes can be been looked at as 'sound changes', but this is just looking at the phonetic changes a language goes through. There are problems with looking at historical change like this, as can be seen by theories of phonology, theories of how humans learn language, and thus how language is relearned by every person, and even by evidence from looking comparitively at certain languages and making an attempt to relate them historically.

Evidence from Turkic

Let's take a look at Kazakh, Tatar, and Bashkir