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.

The DDT is an colorless, tasteless chemical compound which was originally developed as an insecticide. DDT was used during second world war to control malaria among the troops and the civilians.

straight probes are used primarily for measuring flow as it is approaching the test area. its geometry allows the probe to be mounted so that it is in the direct line of airflow.