Why did the united states ban the use of ddt? it began mutating. it became too costly to continue its use. its risks outweighed the benefits. it was no longer effective.

The correct answer is (c)  Its risks outweighed the benefits

DDT was a synthetic pesticide used to cope up the problem of pests in United states. Later, it became hazardous to the plants, humans and animals.  The government of United States found evidences that it is entering into the food chain of the ecosystem. Its harmful effects were conquering the benefits of the pesticide. The risks grew so much that it became important for the government of  United States to ban it.

humans are now responsible for causing changes in the environment that hurt animals and plant species. we take up more space on earth for our homes and cities. we pollute habitats. human activity often changes or destroys the habitats that plants and animals need to survive.