I'd agree with Bonzai.

the ability to communicate has evolved in all humans and practically all life, [i]how[i] and in what form that communication takes depends is learned and not necessarily evolved. I guess the communication techniques "evolved" as symbols try to represent sounds. You'd be fairly hard pressed to understand the Saxon chronicles even if it is "olde English"

ahhh screw it, im talking rubbish. i saw a programme once where the scientist said that all humans are born with the knowledge of language, I felt it was the wrong thing to say; and that we are born with the knowledge of communication, language is learned, so i reckon writing is part of that learned communication system.

Im no anthropologist or whatever so feel free to put me right