( ( ( The ( ( distribution and ) abundance ) ) ( of ( ( ( organisms and ) populations ) ( in ecosystems ) ) ) ) ( ( are ( ( limited ( by ( ( ( ( the availability ) ( of ( ( matter and ) energy ) ) ) and ) ( ( the ability ) ( of ( the ecosystem ) ) ) ) ) ) ( to ( recycle ( organic materials ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN distribution) (CC and) (NN abundance)) (PP (IN of) (NP (NP (NNS organisms) (CC and) (NNS populations)) (PP (IN in) (NP (NNS ecosystems)))))) (VP (VBP are) (VP (VBN limited) (PP (IN by) (NP (NP (NP (DT the) (NN availability)) (PP (IN of) (NP (NN matter) (CC and) (NN energy)))) (CC and) (NP (NP (DT the) (NN ability)) (PP (IN of) (NP (DT the) (NN ecosystem)))))) (S (VP (TO to) (VP (VB recycle) (NP (JJ organic) (NNS materials))))))) (. .)))
The distribution and abundance of organisms and populations in ecosystems are limited by the availability of matter and energy and the ability of the ecosystem to recycle organic materials.
(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))))))))) (. .)))