It is believed that a mother language developed somewhere in which area?

It's believed that a mother language, or proto-language, developed somewhere in Africa.

Here's why:

* Genetic Evidence: Studies of human mitochondrial DNA and the Y chromosome suggest that modern humans originated in Africa and migrated outwards, spreading their languages with them.

* Linguistic Diversity: Africa has the greatest linguistic diversity of any continent, suggesting it has been home to language development for a very long time.

* Deep Linguistic Roots: Many language families found across the globe seem to have connections to languages spoken in Africa, hinting at a shared ancestry.

However, pinpointing the exact location within Africa is difficult. It's likely that the proto-language evolved over time in a specific region, but the location is still debated by linguists.

It's important to remember that this is a scientific theory and not a definitive answer. More research and analysis are needed to understand the exact origins of language.