( They ( ( ( ( ( play ( ( an ( important role ) ) ( in ( aquatic ecosystems ) ) ) ) ( as scavengers ) ) , ) ( ( ( cleaning up ) ( dead ( ( plants and ) animals ) ) ) ( for ( their food ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBP play) (NP (NP (DT an) (JJ important) (NN role)) (PP (IN in) (NP (JJ aquatic) (NNS ecosystems)))) (PP (IN as) (NP (NNS scavengers))) (, ,) (S (VP (VBG cleaning) (PRT (RP up)) (NP (JJ dead) (NNS plants) (CC and) (NNS animals)) (PP (IN for) (NP (PRP$ their) (NN food)))))) (. .)))
They play an important role in aquatic ecosystems as scavengers, cleaning up dead plants and animals for their food.
(ROOT (S (NP (NP (DT A) (NN role)) (PP (IN of) (NP (NP (NNS mushrooms)) (PP (IN in) (NP (NNS ecosystems)))))) (VP (VBZ is) (VP (VBG breaking) (PRT (RP down)) (NP (JJ dead) (NN plant) (NN material)))) (. .)))