( ( ( Sexual reproduction ) ( in ( a ( nonvascular plant ) ) ) ) ( ( is ( ( a ( two-part ( life cycle ) ) ) ( called ( alternation ( of ( ( generations , ) ( also ( known ( as ( ( metagenesis or ) heterogenesis ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Sexual) (NN reproduction)) (PP (IN in) (NP (DT a) (NN nonvascular) (NN plant)))) (VP (VBZ is) (NP (NP (DT a) (JJ two-part) (NN life) (NN cycle)) (VP (VBN called) (NP (NP (NN alternation)) (PP (IN of) (NP (NP (NNS generations)) (, ,) (VP (ADVP (RB also)) (VBN known) (PP (IN as) (NP (NNS metagenesis) (CC or) (NNS heterogenesis)))))))))) (. .)))
Sexual reproduction in a nonvascular plant is a two-part life cycle called alternation of generations, also known as metagenesis or heterogenesis.
(ROOT (S (NP (NNP Nonvascular) (NNS plants)) (VP (VBP are) (NP (NP (DT the) (JJ only) (NNS plants)) (PP (IN with) (NP (DT a) (NN life) (NN cycle))) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (DT the) (JJ gametophyte) (NN generation)) (VP (VBZ is) (ADJP (JJ dominant))))))) (. .)))