( ( ( Circulation ( of ( ( energy and ) matter ) ) ) ( in ecosystems ) ) . )
(ROOT (NP (NP (NN Circulation)) (PP (IN of) (NP (NN energy) (CC and) (NN matter))) (PP (IN in) (NP (NNS ecosystems))) (. .)))
Circulation of energy and matter 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))))))))) (. .)))