Among the factors necessary for the occurrence of some event, which of these are selectively highlighted in its explanation and labeled as causes -and which are explanatorily omitted, or relegated to the status of background conditions? Following J. S. Mill, most have thought that only a pragmatic answer to this question was possible. In this paper I suggest we understand this 'causal selection problem' in causal-explanatory terms, and propose that explanatory trade-offs between abstraction and stability can provide a principled solution to it. After sketching that solution, it is applied to a few biological examples, including to a debate concerning the 'causal democracy' of organismal development, with an anti-democratic (though not a gene-centric) moral.
1-Introduction: Explanatory Sparseness and SystematicityOur universe is dizzyingly complex, and everything that happens within it causally depends on innumerable other things. The living world in particular can appear almost horrifically complicated. Though some of this complexity remains beyond our grasp, scientists have unraveled ever-larger portions of it. The combination of this complex world and our increasingly sophisticated theories accounting for it should make two features of our causal-explanatory practice appear surprising: its sparseness and its systematicity.Explanatory practice is sparse in that many apparently legitimate causal explanations are rather thin affairs, in which happenings are accounted for with only the tiniest sliver of information, and not by citing all, or even very many, of an event's causal influences. 2 Explanatory practice is systematic in that those few morsels that sparse explanations feed to us do not seem to emerge higgledy-piggledy, as if they were the output of some 'explanatory lottery' in 1 For helpful comments on this paper, thanks to David Frank, Maria Kronfleldner, Michael Strevens and David Velleman. Special thanks are due to the editors of this volume, PierreAlain Braillard and Christophe Malaterre, both for their patience and for their perceptive editorial suggestions. 2 The distinction between explanations as communicative acts and explanations construed in an 'ontic' mode as sets of facts will not loom large in this paper; throughout, I will presume that the content of communicative acts are the explanatorily relevant facts.