( ( For example ) ( , ( ( birds ( and ( insect wings ) ) ) ( ( have ( ( ( evolved ( to ( support flight ) ) ) , ) ( not ( because ( ( ( birds and ) insects ) ( ( share ( a ( common ancestor ) ) ) ( with ( this feature ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN For) (NP (NN example))) (, ,) (NP (NNS birds) (CC and) (NN insect) (NNS wings)) (VP (VBP have) (VP (VBN evolved) (S (VP (TO to) (VP (VB support) (NP (NN flight))))) (, ,) (SBAR (RB not) (IN because) (S (NP (NNS birds) (CC and) (NNS insects)) (VP (VBP share) (NP (DT a) (JJ common) (NN ancestor)) (PP (IN with) (NP (DT this) (NN feature)))))))) (. .)))
For example, birds and insect wings have evolved to support flight, not because birds and insects share a common ancestor with this feature.
(ROOT (S (NP (NP (DT The) (NN bird) (NN ancestor)) (SBAR (WHNP (WDT that)) (S (VP (VBD lived) (PP (IN in) (NP (NNS trees))))))) (VP (VBD developed) (NP (NP (NNS wings)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (ADVP (RB commonly)) (VP (VBN associated) (PP (IN with) (NP (NNS birds))))))))) (. .)))
The bird ancestor that lived in trees developed wings, which is commonly associated with birds.