 In biology and medicine such structural explanations are found in terms of “topological explanations”. Much of the interest in this area has been the analysis of whether, and if so how, such explanations differ from mechanistic explanations (see Huneman 2010, Brigandt 2013, Woodward 2013, Jones 2014, Kostic 2016, Huneman 2018, Darrason 2018 for case studies and further references). A characteristic of such explanations is that one makes use of graph-theoretic or topological properties of a system to explain properties of the system such as stability under perturbations. 