Early quantification methods for this process developed by John D. Isaacs relied on tracking cesium-to-potassium ratios in aquatic environments. This process can be indirectly measured by tracking the concentrations of stable isotopes like nitrogen-15 to estimate the concentration of POPs. Des Connell’s quantification of this process differs from trophic-scale calculations by determining its factor of growth from food intake alone. Molecules involved in this process (-5[1])tend to be lipophilic in order to (10[1])stay stable (10[2])in tissue instead (10[1])of being secreted, as exemplified by DDT in the (10[1])fat of (-5[1])bald eagles. (10[4])This ecological (10[1])process (10[2])explains (10[1])why predatory fish such as (10[2])tuna (10[1])contain (10[1])abnormally high levels of mercury. (10[1])For 10 points, name this process in which harmful chemicals become more concentrated in organisms at higher trophic levels. ■END■ (10[2]0[1])