As much as one cannot explain a tree's creation and composition in fine detail - a task relegated only to a supreme intelligence and initial cause of all things - one cannot also explain the process of something as basic as a pencil in detail. Not one mind has the wherewithal to do so. This is the very myopic view that many inherit naturally when attempting to view a world where functions such as defense, first-class mail delivery, road construction and etc is done without governmental edict. One mind cannot grasp the enormity behind these services, however, seeing as if simple objects require the coming together of many individuals, why is it that this same principle cannot be applied as a broad stroke of the brush when it comes to everything provided to us via public entities? I submit that it certainly can.
Now go and indulge your brain and read this wonderful essay at Mises.org: