The answer is <span>insect and pest populations decreased.
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DDT (dichlorodiphenyltrichloroethane) was used as an insecticide which is a substance used to kill insects. That resulted in decrease in insect and pest populations. It is a persistent and non-degradable insecticide, but as well organic pollutant readily accumulated to soils and consequently affects organisms.
Answer:
I think it explains that the DNA molecules are double helix with alenine and thymine paired together
Both have phosphate-pentose back bone, as well as both have adenine, cytosine and guanine bases.
