External considerations Hence, the substances of concern may both bioaccumulate in lower life forms and biomagnify or increase their concentration in higher life forms by oeders of magnitude as they accumulate and migrate up the food chain 四大学化学学院 2002年7月26日 13四川大学化学学院 2002年7月26日 13 External considerations ◼ Hence, the substances of concern may both bioaccumulate in lower life forms and biomagnify or increase their concentration in higher life forms by oeders of magnitude as they accumulate and migrate up the food chain