1.) The reason why is because Berber is an oral language. It is not written down, but since traditions need to be passed down and Berber culture is about to start fading away, the only solution is to record their culture. But Berber is still an oral language.
2.) The Tifinagh is the only written Berber dialect because their culture is fading away and since the children do not want to keep their traditions anymore and want to move to the city, later on, people will never hear about Berber. Other people won’t know specifically what traditions the Berbers practiced. In
3.) Refer to answer number 2.
4.) The Chadic live near Lake Chad. The Cushitic come from Somali.
5.) Refer to answer number 2.
6.) Well, maybe Arabs should try and preserve it by speaking it, but Berber has to becoma a more official language. Just like Swiss, Arabic, English, French etc... In my personal opinion, not only do the Arabs need to contribute their help in speaking Berber, but also other civilizations.
7.) I do not know what you mean by their invaders, but I think that the Berbers themselves decided to invent their own language to be able to communicate.
8.) Refer to number 2.
9.) The reason why is because Berber is mostly an oral language. You usually do not see a Berber writing or reading. But until it was decided for them to have their own written dialect so they could be able to record their dailey lives and traditions.
10.) Personally, I do not think so. But I do believe that the Berbers have not come from only one specific place, as I explained in my essay, this is still an unsolved mystery, but I do believe that Berbers come from many different places and cultures to make their own in one place. That is maybe why you might see some blue-eyed Berbers, or red-hair etc...