In your opinion what was the most important change brought by development of language?

It's impossible to pinpoint *the* most important change brought by language development, as it revolutionized so many aspects of human life. However, I'd argue the ability to share complex thoughts and ideas is the single most significant impact. Here's why:

* Collective knowledge and cultural transmission: Language allows us to pass down knowledge, experiences, and beliefs across generations. This forms the foundation of culture, history, and societal progress.

* Enhanced cooperation and social bonds: Shared language fosters understanding, collaboration, and empathy. It enables us to build relationships, negotiate, and solve problems together.

* Abstraction and problem-solving: Language lets us think abstractly, form concepts, and reason logically. This fueled our capacity for innovation, technology, and scientific advancement.

* Self-awareness and identity: Language allows us to reflect on our own thoughts and emotions, express our individuality, and develop a sense of self.

While other changes are also important, like increased cognitive abilities and enhanced memory, the ability to share complex thoughts and ideas has truly been the bedrock of human evolution and progress. It allowed us to transition from solitary individuals to complex, interconnected societies, shaping the world we know today.

Of course, the impact of language is vast and multifaceted. It's important to consider all its effects, from cultural development to individual growth, to fully understand its importance.