It is likely that a mother tongue unique to all the languages spoken today (about 6,000 languages) has existed, even if this is not demonstrable and that many linguists do not pronounce on this subject. Linguists nevertheless manage to group languages into large families (Indo-European, Afro-Asiatic, Sino-Tibetan, etc.) on the basis of their similarities, and to estimate their approximate age. It is a laborious work and that provokes many disputes! In fact, it is thought that some of these great families have spread to different continents by giving many daughter-tongues when humans invented agriculture and animal domestication, starting from the Neolithic period beginning 10,000 years ago. . Why? Because this change in lifestyle has allowed them to become more numerous, to settle around the world, and to develop new means of communication. Finally, if a stone is called "stone" and not "tappe", at the beginning it is totally arbitrary, that is to say that there is no particular reason.
Language has always fascinated mankind. The history of linguistics is so long. Linguistics is the systematic language study. Thousands of years ago, people used to meditate on languages. As a result, there are different methods of different cultures and different descriptions of languages arise. Today, linguistics is based on very ancient theories. Many traditions were established in particular Greece. The oldest language comes from India. It was written 3,000 years ago by linguist Saketaya. In ancient times, Plato involved himself with the philosophical language. Later Roman writers developed the language with their theory. Arabs developed their own tradition in the 8th century. Even then, their work displays specific details in Arabic. In modern times, researchers study where humans come from. Scholars had a special interest in the history of language. In the 18th century, people began to compare languages with each other. They wanted to understand how languages are developed. Afterward, they have contended on language as a method. The focal point of the language function was questioned. Today, a large number of school thought exists in linguistics. Many new things have improved from the halves. This was strongly influenced by other sciences. It is very special of new linguistic schools of thought. An example of this is feminine linguistics. So the history of linguistics continues. As long as there are languages, people will think of them!
Imagine for a moment that you're an early human roaming endless savanna of the African continent some, 3 million years ago.
Noise making repertoire of most your tribe is no different than that of a chimp.
High pitch yells, and low pitch grunts.
But you are different, you are born with a new mutation that set your voice box a little higher in your throat than that of your clansman.
You find out you can make noises that have not been used by any of your kin in your presence.
You know that yells are good for signaling danger.
Grunts are good to calm each other down when grooming.
But this new noise, it don't fit anywhere.
So what's the use for it?
One day, you notice a danger, a tiger is approaching in the grass.
Tiger is a much bigger problem than a hyena your tribe have to fend off most of the time.
The tiger is silent and powerful predator.
You cannot communicate something as complex are "Danger, In the Grass, There" with just yells.
You get frustrated, and you let out the new noise followed by a yell for danger.
Your companions did not pick up on that cue, and at least one got mauled to death.
But you just created a first sentence.
Your offspring that carries your genes, learned from there how to use the new noise between each other to their advantage, and maybe some other that don't have the same ability but picked up the cue will rely on you and your bloodline for survival.
2 million years later, what was initially a single additional noise, have become a whole spectrum of noises, now compiled into words and even some form of grammar.
Forming first language.
After that, it's just expanding upon the knowledge passed down to us by our parents and elders.
Every year to this day, language is slightly different than the year before, and while it's not always the case, every year, we add new words, I'd hope, every year, the language becomes more accurate in conveying information, thoughts, and feelings.
There are currently some proto-languages that have less than 500 words.
And there are languages with many tens of thousands of words.
Language is a advantageous trait, just as any evolutionary adaptation is subject to selective pressure.
That's why it changes.
That's why isolated languages remain simple, and those which are subject to many interactions, become more complex.
That is the origin of language.