( ( Aerobic respiration ) ( ( ( occurs ( at ( ( a ( faster rate ) ) ( than ( anaerobic respiration ) ) ) ) ) ( because ( bacteria ( are ( able ( to ( ( metabolize ( more quickly ) ) ( in ( ( the presence ) ( of ( ( oxygen and ) heat ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Aerobic) (NN respiration)) (VP (VBZ occurs) (PP (IN at) (NP (NP (DT a) (JJR faster) (NN rate)) (PP (IN than) (NP (JJ anaerobic) (NN respiration))))) (SBAR (IN because) (S (NP (NNS bacteria)) (VP (VBP are) (ADJP (JJ able) (S (VP (TO to) (VP (VB metabolize) (ADVP (RBR more) (RB quickly)) (PP (IN in) (NP (NP (DT the) (NN presence)) (PP (IN of) (NP (NN oxygen) (CC and) (NN heat))))))))))))) (. .)))
Aerobic respiration occurs at a faster rate than anaerobic respiration because bacteria are able to metabolize more quickly in the presence of oxygen and heat.
(ROOT (S (NP (JJ Anaerobic) (NN respiration)) (VP (VBZ occurs) (SBAR (IN if) (S (NP (NN oxygen)) (VP (MD can) (RB not) (VP (VB be) (VP (VBN obtained) (PP (IN at) (NP (DT a) (JJ sufficient) (NN rate))))))))) (. .)))