( ( ( energy ( and ( matter exchange ) ) ) ( in ecosystems ) ) ; )
(ROOT (NP (NP (NN energy) (CC and) (NN matter) (NN exchange)) (PP (IN in) (NP (NNS ecosystems))) (: ;)))
energy and matter exchange in ecosystems;
(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))))))))) (. .)))