The Introduction of the Brown Tree Snake in the 1940s

The introduction of the brown tree snake in the 1940s to the island of Guam has resulted in

A) eradication of nonnative rats and other undesirable/pest species.
B) the extirpation of many of the island's bird and reptile species.
C) a good lesson in biological control.
D) new species of hybrids from breeding with native snake species.
E) failure to compete with native species and its quick elimination from the island.