Ddt was banned in the united states because it:
did not kill harmful insects
killed the plants it was sprayed on
collects in animal tissue and poisons them
was too expensive to produce

it collects in animal tissue and poisons them

kelp are large brown algae that live in cool, relatively shallow waters close to the shore. they grow in dense groupings much like a forest on land. these underwater towers of kelp provide food and shelter for thousands of fish, invertebrates, and marine mammal species.

e) all of the above