Because the lungs have to work harder to remove the chemicals, the body has to work harder to get the air needed to survive.
(the lungs; to work harder; to remove the chemicals) Context(the lungs to work harder,List([8, 37))):(the lungs; to work harder to remove; the chemicals) (the air; needed; to survive) (the body; to work harder; to get the air) Context(the body to work harder,List([63, 90))):(the body; to work harder to get; the air needed)
the lungs to work harder,List([8, 37)) the body to work harder,List([63, 90))
the lungs the lungs the air the body the body
to work harder to work harder to remove needed to work harder to work harder to get
to remove the chemicals
the chemicals
to survive
to get the air
the air needed