Dr. Libokov: Certain islands near New Zealand are home to the tuatara, reptiles that are the sole surviving members of the sphenodontidans. Sphenodontidans were plentiful throughout the world during the age of the dinosaurs. But the survival of sphenodontidans near New Zealand, and their total disappearance elsewhere, is no mystery. New Zealand or cats, have been introduced in recent years, the tuatara are now extinct or nearly so.
What this question is testing
Your task
Describe how the argument proceeds — the technique it uses to reach its conclusion.
Common trap
Answers that describe a method the argument doesn't actually use.
Winning move
Track the role each statement plays, then match that to the choice describing the same moves.
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