( Physiological ( ( traits and ) adaptations ) )
(ROOT (S (VP (VB Physiological) (NP (NNS traits) (CC and) (NNS adaptations)))))
Physiological traits and adaptations
(ROOT (S (NP (NP (DT A) (-LRB- -LRB-) (NN n) (-RRB- -RRB-)) (NP (JJ favorable) (NN trait))) (VP (VBZ is) (NP (DT an) (NN adaptation))) (. .)))
A(n) favorable trait is an adaptation.