( ( ( The response ) ( of ( ( the ( human ear ) ) ( to ( ( different intensities ) ( at ( fixed ( sound frequency ) ) ) ) ) ) ) ) ( ( is ( close ( to ( being logarithmic ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN response)) (PP (IN of) (NP (NP (DT the) (JJ human) (NN ear)) (PP (TO to) (NP (NP (JJ different) (NNS intensities)) (PP (IN at) (NP (JJ fixed) (JJ sound) (NN frequency)))))))) (VP (VBZ is) (ADJP (JJ close) (PP (TO to) (S (VP (VBG being) (ADJP (JJ logarithmic))))))) (. .)))
The response of the human ear to different intensities  at fixed sound frequency is close to being logarithmic.
(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))))))))) (. .)))