( Metabolism ( ( is ( ( the sum ) ( of ( ( all ( the ( chemical reactions ) ) ) ( that ( ( ( take in ) and ) ( ( transform ( ( energy and ) materials ) ) ( from ( the environment ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Metabolism)) (VP (VBZ is) (NP (NP (DT the) (NN sum)) (PP (IN of) (NP (NP (PDT all) (DT the) (NN chemical) (NNS reactions)) (SBAR (WHNP (WDT that)) (S (VP (VP (VB take) (PRT (RP in))) (CC and) (VP (VB transform) (NP (NN energy) (CC and) (NNS materials)) (PP (IN from) (NP (DT the) (NN environment))))))))))) (. .)))
Metabolism is the sum of all the chemical reactions that take in and transform energy and materials from the environment.
(ROOT (S (NP (NP (DT The) (NN sum)) (PP (IN of) (NP (NP (DT all) (JJ chemical) (NNS reactions)) (SBAR (WHNP (WDT that)) (S (VP (VBP take) (NP (NN place)) (PP (IN within) (NP (DT an) (NN organism))))))))) (VP (VBZ is) (VP (VBN known) (PP (IN as) (NP (NN metabolism))))) (. .)))
The sum of all chemical reactions that take place within an organism is known as metabolism.