Here's why:
* Languages evolve over time. Languages change and branch out into new languages through a process called language evolution. This means that modern languages have evolved from earlier languages, and those earlier languages from even earlier ones.
* The concept of a "proto-language" is used to describe the hypothetical ancestor of a family of languages. For example, Proto-Indo-European is the proposed ancestor of many languages in Europe, Asia, and the Americas. However, even proto-languages evolved from other, even older languages.
* The timeline of language development is vast and complex. There's no single point in history where we can pinpoint the origin of all languages.
Instead of a single mother language, linguists believe in a tree of languages where languages branch and evolve over time.
The search for the origin of language itself is still ongoing. While we can trace the evolution of languages back thousands of years, the very first language remains unknown.