Passage Summary: Historians wonder why the Norse settlers in Greenland died out while the Inuit settlers in the exact same area at the exact same time managed to survive for centuries.

Reasoning: The passage notes that while temperatures dropped in Greenland, the Norse disappeared while the Inuit, living in the same environment, continued to thrive.

Analysis: The paradox here is the divergent outcomes for two groups facing the same environmental stressor: falling temperatures. To resolve this, we need a piece of information that distinguishes the Norse from the Inuit in a way that explains the former's failure or the latter's success. Look for an answer that highlights a cultural, technological, or dietary difference. For instance, if the Norse relied on farming that failed in the cold while the Inuit relied on whale hunting, the mystery of why one group vanished while the other thrived is solved.