it is even easier to show how vehicles do not fall into a nested hierarchy
I've not read all of this thread, but I think it's worth pointing out while vehicles do not
fall into a nested hierarchy, there are many ways of
arranging them in a nested hierarchy, with no objective reason to prefer one over another. OTOH, life
falls into one nested hierarchy, as measured by at least two objective measures, and there is no other objectively equivalent nested hierarchy of life.