According to the passage, before the discovery of new techniques for detecting viral DNA, population ecologists believed that viral diseases_出国考试答疑器_GMAT

According to the passage, before the discovery of new techniques for detecting viral DNA, population ecologists believed that viral diseases

A、were not widely prevalent among insect populations generally

B、affected only the caterpillar life stage of lepidoptera

C、were the driving force behind lepidoptera population cycles

D、attacked already declining caterpillar populations

E、infected birds and parasites that prey on various species of lepidoptera

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