( ( ( The rate ) ( ( at which ) ( enzymes work ) ) ) ( ( can ( be ( influenced ( by ( ( internal ( environmental factors ) ) ( such ( as ( ( pH and ) temperature ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN rate)) (SBAR (WHPP (IN at) (WHNP (WDT which))) (S (NP (NNS enzymes)) (VP (VBP work))))) (VP (MD can) (VP (VB be) (VP (VBN influenced) (PP (IN by) (NP (NP (JJ internal) (JJ environmental) (NNS factors)) (PP (JJ such) (IN as) (NP (NN pH) (CC and) (NN temperature)))))))) (. .)))
The rate at which enzymes work can be influenced by internal environmental factors such as pH and temperature.
(ROOT (S (NP (NP (NNP Temperature)) (CC and) (NP (NN ph) (NN level))) (VP (VBP are) (ADJP (JJ important) (PP (IN in) (NP (NP (DT the) (NN activity)) (PP (IN of) (NP (DT an) (NN enzyme))))))) (. .)))