( ( ( The ( mode reproduction ) ) ( used ( by ( most animals ) ) ) ) ( , ( however ( , ( ( is ( ( ( sexual reproduction ) , ) ( ( in which ) ( ( ( ( a ( diploid zygote ) ) or ) ( fertilized egg ) ) ( is ( ( produced ( from ( ( the fertilization ) ( of ( a ( haploid egg ) ) ) ) ) ) ( by ( a ( haploid sperm ) ) ) ) ) ) ) ) ) . ) ) ) ) )
(ROOT (S (NP (NP (DT The) (NN mode) (NN reproduction)) (VP (VBN used) (PP (IN by) (NP (JJS most) (NNS animals))))) (, ,) (ADVP (RB however)) (, ,) (VP (VBZ is) (NP (NP (JJ sexual) (NN reproduction)) (, ,) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (NP (DT a) (JJ diploid) (NN zygote)) (CC or) (NP (VBN fertilized) (NN egg))) (VP (VBZ is) (VP (VBN produced) (PP (IN from) (NP (NP (DT the) (NN fertilization)) (PP (IN of) (NP (DT a) (JJ haploid) (NN egg))))) (PP (IN by) (NP (DT a) (JJ haploid) (NN sperm))))))))) (. .)))
The mode reproduction used by most animals, however, is sexual reproduction, in which a diploid zygote or fertilized egg is produced from the fertilization of a haploid egg by a haploid sperm.
(ROOT (S (NP (NP (JJ Sexual) (NN reproduction)) (PP (IN with) (NP (NNS gametes) (CC and) (NN fertilization)))) (VP (VBZ produces) (NP (JJ diploid) (NN sporophyte))) (. .)))