( But ( ( most importantly ) ( , ( ( cell division ) ( ( enables ( organisms ( that ( are ( able ( to ( sexually ( reproduce ( to ( develop ( from ( ( the ( ( one-celled fertilised ) egg ) ) ( -LRB- ( zygote -RRB- ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) ) ) ) )
(ROOT (S (CC But) (ADVP (RBS most) (RB importantly)) (, ,) (NP (NN cell) (NN division)) (VP (VBZ enables) (NP (NP (NNS organisms)) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (ADJP (JJ able) (S (VP (TO to) (VP (ADVP (RB sexually)) (VB reproduce) (S (VP (TO to) (VP (VB develop) (PP (IN from) (NP (NP (DT the) (ADJP (JJ one-celled) (JJ fertilised)) (NN egg)) (PRN (-LRB- -LRB-) (NP (NN zygote)) (-RRB- -RRB-)))))))))))))))) (. .)))
But most importantly, cell division enables organisms that are able to sexually reproduce to develop from the one-celled fertilised egg (zygote).
(ROOT (S (NP (JJS Most) (NN fish)) (VP (VB reproduce) (PP (IN with) (NP (CD one) (DT another))) (ADVP (RB sexually))) (. .)))