plants help remove carbon dioxide, which is poisonous to humans, from the air;
(carbon dioxide; is; poisonous to humans, from the air) (plants; help; remove carbon dioxide) Context(plants help,List([0, 11))):(plants; help remove; carbon dioxide, which is poisonous to humans, from the air)
plants help,List([0, 11))
carbon dioxide plants plants
is help help remove
poisonous to humans, from the air
remove carbon dioxide
carbon dioxide, which is poisonous to humans, from the air