( ( In ( sexual reproduction ) ) ( , ( ( the egg ) ( ( unites ( with ( ( ( ( ( ( it 's ) ( male counterpart ) ) , ) ( the ( sperm cell ) ) ) , ) ( in ( ( the process ) ( of fertilization ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (JJ sexual) (NN reproduction))) (, ,) (NP (DT the) (NN egg)) (VP (VBZ unites) (PP (IN with) (NP (NP (NP (PRP it) (POS 's)) (JJ male) (NN counterpart)) (, ,) (NP (DT the) (NN sperm) (NN cell)) (, ,) (PP (IN in) (NP (NP (DT the) (NN process)) (PP (IN of) (NP (NN fertilization)))))))) (. .)))
In sexual reproduction, the egg unites with it's male counterpart, the sperm cell, in the process of fertilization.
(ROOT (S (NP (NP (JJ Sexual) (NN reproduction)) (, ,) (PP (IN in) (NP (NN general))) (, ,)) (VP (VBZ relies) (PP (IN on) (NP (NP (NNS sets)) (PP (IN of) (NP (NP (NNS cells)) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (NP (NP (NNS precursors)) (PP (IN for) (NP (NNS eggs) (CC and) (NN sperm)))))))))))) (. .)))