( ( a ( severed ( human ear ) ) ) ( ( is ( ( a ( featured prop ) ) ( in ( I. 4 ) ) ) ) . ) )
(ROOT (S (NP (DT a) (JJ severed) (JJ human) (NN ear)) (VP (VBZ is) (NP (NP (DT a) (JJ featured) (NN prop)) (PP (IN in) (NP (NNP I.) (CD 4))))) (. .)))
a severed human ear is a featured prop in I.4.
(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))))))))) (. .)))