i got tht,,there are lot of theories of origin of language......like bow wow theory,,,mimicry,,,and divine source of language,,,,,,,,,,,and yes this is rite tht these are all speculations but to some extent no it is so major topic ...if we think over it ,,it is interesting ..tht how man start to speak and understand and how he starts write,,,as he made pictuers in past time on stonest,,mountains to convey his ideas to others,,,so with the passage of time this question rise how a man starts to communication,,,and how he differ from animal even,,,