( ( The cells ) ( also ( ( need ( oxygen ( for ( ( this series ) ( of ( biochemical reactions ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (DT The) (NNS cells)) (ADVP (RB also)) (VP (VBP need) (NP (NP (NN oxygen)) (PP (IN for) (NP (NP (DT this) (NN series)) (PP (IN of) (NP (JJ biochemical) (NNS reactions))))))) (. .)))
The cells also need oxygen for this series of biochemical reactions.
(ROOT (S (NP (JJ Biochemical) (NNS reactions)) (VP (VBP take) (NP (NP (NN place)) (PP (IN inside) (NP (NP (DT the) (NNS organisms) (POS ')) (NNS cells))))) (. .)))