Can harmful substances accumulate in plants and animals?

Any harmful substances tend to accumulate in the body. If an individual does not possess the ability to remove harmful substances from the body, this substance will accumulate. This is the reason why you cannot graze the thinness that gives milk near highways and roads. Lead, which is contained in car batteries, with exhaust gases comes out of the car and settles on the plants. A cow, eating these plants, accumulates them in the body, part of this lead is excreted in milk. As a result, we drink milk with a harmful substance, which now accumulates in our body.