Biomagnification?

Your teacher probably wants "about tenfold with each trophic level." This scheme would mean your tertiary consumers have 1000 times the amount of the material as the producers.

As you can imagine, the real world is more complicated. Some animals are going to bioaccumulate more than others.

It isn't that simple. You couldn't say, for example, that the concentration in the producers was 5% and then in the primary consumers it was 15%. A lot of factors come into play. First, the substance has to be stored in tissues rather than be excreted. It depends on how well it is stored and whether over time it can be broken down. It would depend on the original concentration stored. It would depend on how many affected organisms were eaten by an organism in the next level of the food chain. Two things are certain: if an organism higher up in the food chain is consuming a lot of affected organisms they will be consuming high levels of the pollutant. We also know that the organism in question may be harmed directly or indirectly. For example, in some species they may not suffer direct harm but if, say, a bird species may lay eggs with a very fragile shell that prevents survival of the chicks in the egg.

,ol