( ( 3 -RRB- ) ( ( Knows ( ( how ( ( the amount ) ( of life ) ) ) ( ( an environment ) ( can support ) ) ) ) ( ( is ( ( limited ( by ( ( ( ( the availability ) ( of ( ( matter and ) energy ) ) ) and ) ( ( the ability ) ( of ( the ecosystem ) ) ) ) ) ) ( to ( recycle materials ) ) ) ) . ) ) )
(ROOT (S (LST (LS 3) (-RRB- -RRB-)) (NP (NP (NNP Knows)) (SBAR (WHADVP (WRB how) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NN life))))) (S (NP (DT an) (NN environment)) (VP (MD can) (VP (VB support)))))) (VP (VBZ is) (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 (NNS materials))))))) (. .)))
3) Knows how the amount of life an environment can support is limited by the availability of matter and energy and the ability of the ecosystem to recycle 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))))))))) (. .)))