Here's why:
* Communication is key: Language is the primary tool for communication, and communication is essential for building and maintaining social structures. As societies became more complex, they needed more sophisticated ways to communicate, which drove the development of language.
* Shared knowledge and culture: Language allows for the transmission of knowledge, beliefs, and values across generations. This is vital for the development of culture and shared identity within a society. As societies grew in size and complexity, their cultural and knowledge base expanded, requiring more complex language systems.
* Cooperation and coordination: Language facilitates cooperation and coordination within groups. This is crucial for tasks like hunting, gathering, building, and defending. As societies evolved, they needed to undertake more complex projects, requiring increased levels of cooperation and coordination, which in turn demanded more sophisticated language.
* Social interaction and bonding: Language plays a crucial role in social interaction, fostering relationships and strengthening social bonds. As societies grew larger and more complex, language evolved to support diverse social structures and roles, contributing to the development of social hierarchies and intricate social networks.
Therefore, the evolution of language is deeply intertwined with the growth and development of human societies. The two processes influenced and shaped each other, leading to the complex and diverse languages we see today.