Here's why:
* No written records: There are no written records from the time when language first emerged, which is estimated to be around 100,000 to 200,000 years ago.
* Limited physical evidence: While we have fossils that provide insights into the evolution of human anatomy, there's very limited physical evidence directly linked to the origins of language.
* Complex process: Language is a complex system involving many interacting elements (sounds, grammar, meaning), making it difficult to pinpoint how all these elements came together.
* Multiple theories: There are various theories about language development, including:
* The "bow-wow" theory: Language arose from imitating animal sounds.
* The "yo-he-ho" theory: Language originated from the grunts and shouts used during physical labor.
* The "gesture theory: Language evolved from gestures.
* The "social interaction theory: Language developed as a way to facilitate social interaction.
* Ongoing research: Linguists continue to investigate language origins through various means, including studying modern languages, analyzing brain structures, and examining primate communication.
In summary: While linguists have developed numerous theories and gathered evidence, the exact process of language development remains a mystery. It's a complex question with no definitive answer.