Why are humans so special? Because we can self analyze and assign meaning to the world around us. Let me demonstrate. Breath comes from external stimuli-Air. And we need the air to live. We also need sunlight, water and food. All these things we NEED do not come from us exclusively. Sure we could have been made into gods living on spirit alone, but I am grateful for my dependence because I can make a greater connection to the world and then feel the fullness of my existence. I am connected to the air, water, sun, plants, and animals. It is a majestic and beautiful thing to be human. So to answer the question: We breathe so that we may one day see it for what it is. A connection, a fuller, more meaningful existence.