( Mollusks ( ( ( ( ( are ( ( a ( diverse group ) ) ( of animals ) ) ) , ) and ) ( ( play ( crucial roles ) ) ( in ( various ecosystems ) ) ) ) . ) )
(ROOT (S (NP (NNS Mollusks)) (VP (VP (VBP are) (NP (NP (DT a) (JJ diverse) (NN group)) (PP (IN of) (NP (NNS animals))))) (, ,) (CC and) (VP (VBP play) (NP (JJ crucial) (NNS roles)) (PP (IN in) (NP (JJ various) (NNS ecosystems))))) (. .)))
Mollusks are a diverse group of animals, and play crucial roles in various ecosystems.
(ROOT (S (NP (NNP Beneficial) (NNS fungi)) (VP (VBP play) (NP (NP (DT a) (JJ crucial) (NN role)) (PP (IN in) (NP (NP (NN balance)) (PP (IN of) (NP (NNS ecosystems))))))) (. .)))
Beneficial fungi play a crucial role in balance of ecosystems.