Which statement best describes one positive and one negative way that society was impacted by the use of ddt? a)society was positively impacted by increased insect control in crops, but it was negatively impacted by harmful chemicals. b)society was positively impacted by insect resistance, but it was negatively impacted by harmful chemicals. c)society was positively impacted by increased insect control in crops, but it was negatively impacted by malaria and typhus. d)society was positively impacted by insect resistance, but it was negatively impacted by malaria and typhus.

a)society was positively impacted by increased insect control in crops, but it was negatively impacted by harmful chemicals.

Explanation:

DDT is an insecticide that was largely used in the '80s to control the vector of malaria and typhus. It acts in the neurological system, killing the insects.

It was banned in several countries because it is difficult to degrade in nature, and is toxic to humans. So, society was positively impacted by increased insect control in crops, but it was negatively impacted by harmful chemicals.

why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.