Mr. Xu: The arctic squirrel gets so cold while hibernating that its blood temperature falls well below the temperature at which water freezes. Although the squirrel's blood is about 70 percent water, the blood never freezes while the squirrel is hibernating. The squirrel's blood, therefore, from freezing at the temperature at which water freezes.
Ms. Yerky: The blood contains no such substance. Laboratory experiments involving a number of animals, including the arctic squirrel, have shown that a vial of blood from any of the animals as does a vial of water.
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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