Heavy metal is chemically steady. Not able to decay in a natural process, so there is some soil soil accumulated sedimentation sludge is in the water, including the water and accumulates in animals in food.
Heavy metal is chemically stable Can not be degraded in natural processes. So there is some sediment accumulation in the soil. Sediment in the water To accumulate in animals and in food.
Heavy metal compounds. Can decompose in the natural process. So there is some precipitation accumulated in soil, sediment in the water, including the accumulation in aquatic animals and food.