 This account of life needs refinement, but it avoids at least most of the worries mentioned earlier. It implies that an object may be alive even though it is sterile (as in the case of mules), even though it survives on stored energy (as in the case of a silk moth), and conceivably even if it lacks nucleic acid (yet is still composed of things that engage in activities integrated in conformity with information they carry). In fact, it implies that being capable of none of the items on Aristotle’s list is necessary nor sufficient for being alive. What is more, the compositional account just sketched implies that being alive is a property an individual, say the last remaining dodo, may bear on its own, which suggests that it may be alive without being capable of Darwinian evolution. At the same time, it explains how collections of live individuals may evolve. Individual objects are alive only if their composition is under the control of some of their parts (e.g., nucleic acid molecules) that carry information. The mechanisms by which such information is carried tend to be modified over time, altering the information they carry, and thus the features of the organisms they help shape, introducing mutations that may or may not facilitate survival. (For more on the nature of life, see Bedau 2014 and the entry on Life.)