Why were tool-making and language important for the development of human culture?

The early humans could hunt and defend themselves. Some groups of early humans made tools specialized for different categories of work: cooking, cutting, hunting, fire making, etc. As the brain grew up, the early humans started making more complex tools.

As our brain developed, our ability to use language became more complex. We started using different methods of communication. The language made us express ourselves, talk, give information to other people. It is difficult to determine when language was first used. Language is alive and it changes constantly.