Information on brown tree snakes is provided along with information on the island of Guam. Brown tree snakes were first brought to Guam in 1950. Which of the following would provide evidence that the change to this environment brought about by the introduction of the brown tree snake has had an effect on the populations of organisms that lived on Guam?
5 points

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A. The longest brown tree snake ever found on Guam measured three meters in length.

B. The population of lizards on Guam in 1960 was very small.

C. Several other species of snakes were known to live on Guam before 1950.

D. Any of the military bases on Guam were closed in the 1980’s.