( ( Since ( ( coral reefs ) ( play ( ( a ( crucial role ) ) ( in ( marine ecosystems ) ) ) ) ) ) ( , ( ( their destruction ) ( ( could ( ( mean ( ( ( big and ) unpredictable ) trouble ) ) ( for ( ocean life ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN Since) (S (NP (NN coral) (NNS reefs)) (VP (VBP play) (NP (NP (DT a) (JJ crucial) (NN role)) (PP (IN in) (NP (JJ marine) (NNS ecosystems))))))) (, ,) (NP (PRP$ their) (NN destruction)) (VP (MD could) (VP (VB mean) (NP (ADJP (JJ big) (CC and) (JJ unpredictable)) (NN trouble)) (PP (IN for) (NP (NN ocean) (NN life))))) (. .)))
Since coral reefs play a crucial role in marine ecosystems, their destruction could mean big and unpredictable trouble for ocean life.
(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.