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This paper is a defense of "explanatory pluralism" (i.e., the view that some events can be correctly explained in two distinct ways). To defend pluralism, I argue that a certain class of macroevolutionary trends (what I call "asymmetrical passive trends") can be explained in two distinct but compatible ways. The first approach ("actual sequence explanation") is to trace out the particular forces that affect each species. The second approach treats the trend as "passive" or "random" diffusiondoi:10.1086/392727 fatcat:x5w3qrropfgp3fyw4cpimt6nsy