Assertion: trait fitness | /r/HasProperty | difference
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Source sentences:
text: Among those who endorse trait fitness (differences), and not individual fitness (differences), as a fundamental explanatory factor in natural selection, there is a dispute about whether its explanatory role reflects its causal force, or whether trait fitness is a purely statistical concept employed in the theory of natural selection to make demographic predictions about future trait distributions, without entering into any causal nexus among the objects so to speak.