The insecticide ddt was introduced in the 1950s, and the rates of malaria dropped significantly. ddt was later found to be toxic to birds and other animals, and it was discontinued in 1964.

as a result, rates of malaria began to rise. how can the effects of ddt on society be characterized?

The correct answer for above statement is:

both positive and negative .

Explanation:

DDT should be used "with caution" in fighting malaria,

DDT () was condemned in Britain in 1986 and prevented as a pesticide worldwide under the Stockholm Convention in 2001 after it was determined to be hazardous to wildlife and the environment.

The 15 environmental health specialists, who evaluated almost 500 health studies, decided that DDT "should be used with caution, only when needed, and when no other adequate, safe and affordable dilemmas are locally accessible.

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qualitative observation deals with data that can be observed with our senses: sight, smell, touch, taste, and hearing. they do not involve measurements or numbers. for instance, colors, shapes, and textures of objects are all qualitative observations.