( ( Be ( able ( to ( ( discuss ( the differences ) ) ( in ( ( life cycle ) ( between ( vascular ( and ( nonvascular plants ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB Be) (ADJP (JJ able) (S (VP (TO to) (VP (VB discuss) (NP (DT the) (NNS differences)) (PP (IN in) (NP (NP (NN life) (NN cycle)) (PP (IN between) (NP (NN vascular) (CC and) (NN nonvascular) (NNS plants)))))))))) (. .)))
Be able to discuss the differences in life cycle between    vascular and nonvascular plants.
(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))))))) (. .)))