What is observable is that reproduction occurs and that the offspring of different kinds of creatures can differ slightly anatomically, physiologically and instinctively, such that we have a wealth of variety of life on this planet able to handle different roles within the environment which together they create. That complex life forms arise from progenitors that are less so is an assumption. That these differences have to do with material differences rather than existential is another that gives more reality to those necessary constituents than one’s own being. That these material differences arose spontaneously, that the order of the over-riding system that is a living being somehow formed itself from the inherent properties of matter, which are chaotic to that order, is an even greater assumption, the randomness of the gaps that I was earlier referring to.