( ( By ( feeding ( on insects ) ) ) ( , ( frogs ( ( ( play ( an ( important role ) ) ) ( in ( maintaining ( ( the balance ) ( of ( our ecosystem ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN By) (S (VP (VBG feeding) (PP (IN on) (NP (NNS insects)))))) (, ,) (NP (NNS frogs)) (VP (VBP play) (NP (DT an) (JJ important) (NN role)) (PP (IN in) (S (VP (VBG maintaining) (NP (NP (DT the) (NN balance)) (PP (IN of) (NP (PRP$ our) (NN ecosystem)))))))) (. .)))
By feeding on insects, frogs play an important role in maintaining the balance of our ecosystem.
(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.