 Consider ordinary composite material objects that are not alive. We can assume that, at a given time, these are made up of, or composed of, more simple things, such as molecules, by virtue of the fact that the latter meet various conditions. Among the conditions is the requirement that (in some sense in need of clarification) they be bonded together. Take the boulder near my front porch. Among the things that compose it now will be a few molecules, say four molecules near the center of the boulder, that are bonded together, in that each is bonded to the others, directly or indirectly (a molecule, A, is indirectly bonded to another molecule, B, if A is directly bonded to a molecule C that is directly bonded to B, or if A is bonded to a molecule that is indirectly bonded to B). The things that make up the boulder are not limited to these four molecules, but they are limited to molecules that are bonded to them. Nor is the boulder unique in this way; something similar seems true of any composite material object. A composite material object is composed of some things at a time only if those things are bonded together at that time.