( ( The ears ) ( ( are ( used ( to ( feed ( human ( ( beings and ) animals ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNS ears)) (VP (VBP are) (VP (VBN used) (S (VP (TO to) (VP (VB feed) (NP (JJ human) (NNS beings) (CC and) (NNS animals))))))) (. .)))
The ears are used to feed human beings and animals.
(ROOT (S (NP (DT The) (NNS ears)) (VP (VBP are) (NP (NP (DT an) (JJ external) (NN feature)) (PP (IN in) (NP (JJ human) (NNS beings))) (SBAR (S (VP (VBZ is) (ADJP (JJ responsible) (PP (IN for) (NP (NN balance))))))))) (. .)))