( and ( ( ( energy and ) matter ) ( ( exchange ( in ecosystems ) ) . ) ) )
(ROOT (S (CC and) (NP (NN energy) (CC and) (NN matter)) (VP (VBP exchange) (PP (IN in) (NP (NNS ecosystems)))) (. .)))
and 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))))))))) (. .)))