( It ( ( serves ( as ( ( a ( common ( , ( global ( backbone-the mother ) ) ) ) ) ( of ( all WANs ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ serves) (PP (IN as) (NP (NP (DT a) (JJ common) (, ,) (JJ global) (JJ backbone-the) (NN mother)) (PP (IN of) (NP (DT all) (NNPS WANs)))))) (. .)))
It serves as a common, global backbone-the mother of all WANs.
(ROOT (S (NP (NP (CD One)) (PP (IN of) (NP (NP (DT the) (JJ main) (NNS features)) (SBAR (S (NP (DT all) (NNS vetebrates)) (VP (VBP have) (VP (PP (IN in) (NP (JJ common)))))))))) (VP (VBZ is) (NP (DT a) (NN backbone))) (. .)))