1 These two senses of “function” are connected obviously. The evolutionary history of some feature of some organism provides an explanation of how it came to have the causal role it does have in the larger system being cited.
2 Donald Davidson, 1980  “Actions, Reasons and Causes”, in Essays on Actions and Events, p. 4, New York: Clarendon Press.
3 The scare quotes here are because of course we are not speaking of logical inconsistency. It is not logically inconsistent to think that giving some of my money to A is good and at the same time that not giving my money to A is good. Nor is it logically inconsistent to want that I have X and want that I not have X. I will drop the scare quotes but clearly the discussion here must understand “inconsistent” in this expanded way.
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Dialogue: Canadian Philosophical Review / Revue canadienne de philosophie