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<p>posit that CNE must be the <a href="page.php?w=null_hypothesis">null hypothesis</a> when explaining the emergence of complex systems to avoid assuming that a trait arose for an adaptive benefit. A trait may have arisen neutrally, even if later <a href="page.php?w=Exaptation">co-opted</a> for another function. This approach stresses the need for rigorous demonstrations of adaptive explanations when describing the emergence of traits. This avoids the "adaptationist fallacy" which assumes that all traits emerge because they are adaptively favoured</p><p>
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