There was an entire aeon of life that produced so much waste that all of the organisms drowned in their own excrement, which happened to be oxygen. Fortunately

There was an entire aeon of life that produced so much waste that all of the organisms drowned in their own excrement, which happened to be oxygen. Fortunately for us now. It might be that the purpose of humans, mammals, multicellular organisms, whatever.....in the holistic sense, is no greater than theirs.