( ( The ( human ecosystem ) ) ( ( ( add complexity ) ( to ( ( the interaction ) ( of ( ( ( matter and ) energy ) ( in nature ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ human) (NN ecosystem)) (VP (VBP add) (NP (NN complexity)) (PP (TO to) (NP (NP (DT the) (NN interaction)) (PP (IN of) (NP (NP (NN matter) (CC and) (NN energy)) (PP (IN in) (NP (NN nature)))))))) (. .)))
The human ecosystem add complexity to the interaction of matter and energy in nature.
(ROOT (S (PP (IN Unlike) (NP (NN energy))) (, ,) (NP (NN matter)) (VP (VBZ does) (RB n't) (VP (VB need) (S (VP (TO to) (VP (VB be) (VP (ADVP (RB constantly)) (VBN added) (PP (TO to) (NP (NNS ecosystems))))))) (SBAR (IN because) (S (NP (PRP it)) (VP (VBZ is) (VP (VBN recycled) (PP (IN through) (NP (NNS ecosystems))))))))) (. .)))