Final answer:
Language as a form of communication, its evolution from spoken to written, and the diversity of language structures and features.
Explanation:
Language is a formal system of gestures, signs, sounds, and symbols used for communication. Linguists believe there are over 6,900 languages in the world today, with diverse structures and rules.
Spoken language existed before written language, and written language has only been a part of human history for a relatively short time. Different languages have distinct features such as sound inventories and sentence structures.
While all cultures have spoken language, not all have a written form. Writing began around 6,000 years ago, with the earliest known system being cuneiform in Mesopotamia.
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