Evolution Theory - please show the proofs

[NoGodaloud ?]

The neural substrate that regulates speech production appears to play a part in syntactic operations and other cognitive processes.

so its just a guess. No proof then.

The isolation and dating of the human form of the FOXP2 gene, which governs the embryonic development of the subcortical structures that support these neural circuits, provide insights on the evolution of human speech, language, and cognition.

“The finding that FOXP2 is critical to speech and language does not by itself demonstrate the role of this gene in the origin of human speech, because the function of FOXP2 could have remained unchanged during human evolution while other speech-related genes changed.”

(Jianzhi Zhang, David M. Webb and Ondrej Podlaha, “Accelerated Protein Evolution and Origins of Human-Specific Features: FOXP2 as an Example,” Genetics, Vol. 162:1825–1835 (December 2002).)

FOXP2 and the Evolution of Language

http://www.evolutionpages.com/FOXP2_language.htm

No-one should imagine that the development of language relied exclusively on a single mutation in FOXP2. They are many other changes that enable speech. Not least of these are profound anatomical changes that make the human supralarygeal pathway entirely different from any other mammal. The larynx has descended so that it provides a resonant column for speech (but, as an unfortunate side-effect, predisposes humans to choking on food). Also, the nasal cavity can be closed thus preventing vowels from being nasalised and thus increasing their comprehensibility. These changes cannot have happened over such a short period as 100,000 years. Furthermore the genetic basis for language will be found to involve many more genes that influence both cognitive and motor skills

Human mind needs human cognition and human cognition relies on human speech. We cannot envisage humanness without the ability to think abstractly, but abstract thought requires language. This finding confirms that the molecular basis for the origin of human speech and, indeed, the human mind, is critical. Ultimately, we will find great insight from further unravelling the evolutionary roots of human speech - in contrast to Noam Chomsky's lack of interest in this subject

I do not think that language
provided the cultural stimulus that triggered human
symbolic thought. Language and other symbolic behaviors
appear to derive from the evolution of a complex interdependent
neural substrate—one that was not present until
50,000 or so years ago.

appear to derive..... that indicates just - guess what ?? guess work.....

have i missed something ? i've not found any conclusive explanation of human language through evolution.

Wanna present a second one, which convinced you ?