What is believed that a mother language developed somewhere in?

There isn't one single location where it's believed that a mother language developed. Linguists and anthropologists generally agree that the first language (the one from which all modern languages descended) likely arose in Africa, somewhere around 150,000 to 200,000 years ago.

However, there's no concrete evidence pinpointing a specific location within Africa. Here's why:

* Early humans were nomadic: The earliest humans migrated widely across Africa.

* Lack of physical evidence: Language doesn't leave physical traces like tools or fossils.

* Multiple theories: There are several competing theories about the origins of language, with different researchers suggesting different areas of Africa as potential starting points.

Instead of focusing on one location, researchers are more interested in understanding the processes that led to the development of language, like:

* Evolution of the vocal tract: Humans developed a vocal tract capable of producing a wide range of sounds.

* Cognitive changes: Humans evolved the ability to think abstractly and use symbols.

* Social interactions: Language likely emerged as a tool for communication and cooperation within early human groups.

So, while we may never know the exact spot where the first language arose, we can continue to learn more about the fascinating journey of human language throughout history.