Yeah, that's like expecting that billions of years of nature selecting among slightly advantageous traits from populations of organisms could lead to life as we know it. (religion.blogs.cnn.com)
In biology, evolution is the process by which populations of organisms acquire and pass on novel traits from generation to generation. (sciencedaily.com)
But a medical revolution is underway that can solve this problem: Astonishing new research is revealing that the health of your brain is, to an extraordinary degree, dictated by the state of your microbiome - the vast population of organisms that live in your body and outnumber your own cells ten to one. (powells.com)