1. What is the difference between pictographic and ideographic scripts/writing systems?
Pictographic script uses graphemes, which constitute visual (pictorial) representations of the objects in the surrounding world and bear much resemblance to the objects they symbolise; whereas, if the graphic symbols are already/almost only conventional representations of concepts - this kind of script is called ideographic.
2. For which languages the writing systems was changed at some point in history?
e.g.: Turkish, Mongolian, Vietnamese, Karaim, Azerbaijani, Uzbek, Moldavian/Romanian
3. From which writing system did most alphabets (as Latin and its varieties, Greek, or Cyrillic) used contemporarily develop?
4. What is transcription?
It is a system of notation in which each phone/sound has its own invariable graphic representation
5. Is it crucial to have/develop a writing system in order to be recognized as a separate language?
Absolutely not – a majority of world’s languages have never developed/used a writing system