Lois Pasteur demonstrated that life comes from life. That is rotten meat doesn't spontaneously produce flies. And Darwin postulates that all life evolved from earlier forms of life. The paradox here is, as I see it, that when we extrapolate back to the creation of the planet we're told that it was a sterile hot and hostile place. The leading theory seems to be that the hotch potch of chemicals in the primitive earth somehow came together to form life. My query is just how "simple" does a molecule have to be to be on the border between life and non life?