DDT was banned in the US in 1972, so why do the estuaries still have DDT in them?

In 1972, EPA issued a cancellation order for DDT based on its adverse environmental effects, such as those to wildlife, as well as its potential human health risks. ... As a result, today, DDT is classified as a probable human carcinogen by U.S. and international authorities.

Explanation:

several tissues working together form an organ, and several organs together make up an organisms.

the group of cell that carries out special jobs are tissue.

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added