Hi there!
Communication changes us because first of all, if we need help on something, we communicate with each other, and we understand new things. Another reason is that if communication could change the world. Like for instance as a community, communicate with others around the world how trash is harmful and could pollute the world. The third reason is that, communication is important in business. By communicating with others about your business, you can improve and help your own business.
This why I think communication is very important.
Hope it helps :)