( ( Sexual reproduction ) ( ( involves ( ( ( ( the combining ) ( of ( a ( sperm cell ) ) ) ) and ) ( ( an ( egg cell ) ) ( from ( two individuals ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Sexual) (NN reproduction)) (VP (VBZ involves) (NP (NP (NP (DT the) (NN combining)) (PP (IN of) (NP (DT a) (NN sperm) (NN cell)))) (CC and) (NP (NP (DT an) (NN egg) (NN cell)) (PP (IN from) (NP (CD two) (NNS individuals)))))) (. .)))
Sexual reproduction involves the combining of a sperm cell and an egg cell from two individuals.
(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)))))))))))) (. .)))