( ( Unlike energy ) ( , ( matter ( ( ( is not ) ( lost ( as ( it ( passes ( through ( an ecosystem ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN Unlike) (NP (NN energy))) (, ,) (NP (NN matter)) (VP (VBZ is) (RB not) (VP (VBN lost) (SBAR (IN as) (S (NP (PRP it)) (VP (VBZ passes) (PP (IN through) (NP (DT an) (NN ecosystem)))))))) (. .)))
Unlike energy, matter is not lost as it passes through an ecosystem.
(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))))))))) (. .)))