The roots of these plants act as living filters: the plant roots absorb and remove many of the toxic substances from waste water.
(the plant roots; remove; many of the toxic substances from waste water) (the plant roots; absorb; ) Context(the plant roots absorb,List([49, 71))):(The roots of these plants; act; as living filters)
the plant roots absorb,List([49, 71))
the plant roots the plant roots The roots of these plants
remove absorb act
many of the toxic substances from waste water
as living filters