Why the human have language , and how generated ?

Nobody has yet come up with a good answer to the question of how and why humans have developed 'language'. Of course, many other animals communicate with sounds but, as far as we know, humans are the only ones who have developed a system capable of communicating such a range of complex ideas and shades of meaning. The best that can really be said is that the development of language must be closely tied to the origins of modern human behaviour. It is logical to assume that we began, like many other animals, to make sounds and gestures which communicated things like fear, anger and pleasure to our fellows but there is also something different in the way our vocal tracts and brain connections are made which makes true language possible. Our closest relatives, the chimpanzees, can make only quite a small range of sounds although they can learn to understand human speech fairly well (as can dogs and horses, for example) and although they can clearly communicate, when taught sign language, at about the level of a five year old human, they can never make speech sounds. A number of birds are really excellent mimics and can learn to reproduce words and even whole phrases perfectly but it is doubtful that they really 'understand' what they are doing in the way that a human understands what another person is saying. If you can read this article: it may help you understand how difficult the whole subject of research into the origins of language is and how many theories there are about when and how it originated. One thing which seems to be corroborated by several different methods of calculation is that language, as we know it today, probably originated around 100,000 years ago in Central Africa at about the same time that the species H. sapiens became differentiated.