They play an important role in aquatic ecosystems as scavengers, cleaning up dead plants and animals for their food.
(They; play; an important role; L:in aquatic ecosystems as scavengers) Context(They play,List([0, 9))):(They; play an important role cleaning up; dead plants and animals)
They play,List([0, 9))
They They
play play an important role cleaning up
an important role L:in aquatic ecosystems as scavengers
dead plants and animals