What Caused the Dramatic Decline in Guam's Native Bird Species

What caused the dramatic decline in Guam's native bird species?

A) climatic change in the region
B) the elimination of its food supply by humans
C) the thinning of their eggshells and the subsequent death of their young as a result of heavy DDT use on the island in the 1970s
D) radiation poisoning caused by nuclear tests of the United States and France
E) the accidental introduction of the non-native brown tree snake

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