 In effect, Queller and Strassmann have proposed a view of evolutionary individuals that is exclusively focused on the regulation of the parts of an evolutionary individual as a means to avoiding subversion from within. In a series of papers, Ellen Clarke has developed a more integrative view of evolutionary individuals that develops this regulative dimension to biological individuality (Clarke 2010, 2012, 2013, 2016a, 2016b). In work focused on plant individuality, Clarke emphasizes the mechanisms that constrain either sources of heritable variation, such as niche construction, bottlenecks, and polyploidy, or fitness differences, such as investment in root connections and the synchronization of flowering (2012: 351, 356). Clarke then argues that something is an evolutionary individual if and only if it possesses what she calls policing and demarcating mechanisms (2013: 427). 