Passage Summary: If you want to know why a culture does something, you have to look at many different groups to make sure your theory isn't just a coincidence.

Conclusion: Social scientists require data from multiple different societies to accurately explain the causes of cultural phenomena.

Reasoning: Without comparative data, one cannot determine if a specific factor is truly necessary or sufficient for a cultural outcome, as seen in the example of political structures and climate.

Analysis: The first sentence is the main conclusion, and the rest of the passage provides a specific example to illustrate why that conclusion is true. The phrase 'for example' is a clear indicator that the second half of the stimulus is serving as evidence for the initial claim. In 'Role in Argument' questions, we must focus strictly on this structural relationship. The claim in question is the broad principle that the rest of the text aims to justify.