( ( The ( acoustic system ) ) ( ( has ( ( two ears ) ( with ( human-like ( external ( physical characteristics ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ acoustic) (NN system)) (VP (VBZ has) (NP (NP (CD two) (NNS ears)) (PP (IN with) (NP (JJ human-like) (JJ external) (JJ physical) (NNS characteristics))))) (. .)))
The acoustic system has two ears with human-like external physical characteristics.
(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))))))))) (. .)))