Passage Summary: If we used the same rules to judge ecology as we do for physics, ecology would be a failure because it's too complex for simple laws. But ecology isn't a failure, so we must be using different rules.

Conclusion: Ecology is not evaluated using the same criteria as the physical sciences.

Reasoning: If ecology were evaluated by physical science criteria, it would fail because it lacks simple laws; however, ecology is a successful science.

Analysis: The structure here is a valid logical form called Modus Tollens: If A, then B. Not B. Therefore, not A. Specifically: If (Same Criteria), then (Ecology Fails). (Ecology does not fail). Therefore, (Not Same Criteria). To find the parallel, look for an answer choice that sets up a conditional, denies the 'then' part (the consequent), and concludes by denying the 'if' part (the antecedent). Don't get distracted by the topic; focus strictly on that 'If P then Q, Not Q, therefore Not P' skeleton.