( ( ( Matter ( and ( Energy Flow ) ) ) ( in ( an Ecosystem ) ) ) . )
(ROOT (NP (NP (NNP Matter) (CC and) (NNP Energy) (NNP Flow)) (PP (IN in) (NP (DT an) (NNP Ecosystem))) (. .)))
Matter and Energy Flow in 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))))))))) (. .)))