 Physiological individuals such as organisms, however, are not simply biological systems but living agents that have a life of their own. They are able to exercise some sort of special degree of control over their whole selves and subsequently are relatively free with respect to other things, including other agents and environments. This might be expressed in terms of both the individual’s relative autonomy from its external environment and its control over the activity of its components or internal parts (R.A. Wilson 2005: 62–65). Organisms in particular have a distinctive kind of agency because of the integrity with which such autonomy and control imbues them. For Moreno and Mossio (2015: ch.6), developmental functions and constraints play an especially important role in establishing this kind of organismic autonomy.