SAT Reading and Writing Practice Question #645 (Hard (800)) | Test Citadel
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SAT Reading and Writing Difficulty: Hard (800)

Digital SAT Reading and Writing Practice Question #645

Test your problem-solving accuracy on this official-caliber item. Select an answer choice to check your reasoning instantly.

A biologist hypothesizes that the reintroduction of apex predators regulates the population of large herbivores, which in turn relieves overgrazing pressure on native riparian (riverbank) plants. To test this, researchers tracked the population of elk (a large herbivore) and the average height of willow trees (a riparian plant) in a national park for ten years following the reintroduction of gray wolves. The collected data demonstrate a strong negative correlation between the elk population and average willow height during the first six years, precisely matching the biologist's expectations. However, in years seven through ten, the elk population definitively stabilized at a historically low number, yet willow tree height abruptly reversed course and declined significantly. Which finding, if true, would best explain the data from years seven through ten?
Select Your Answer:
Socratic AI Engine Step-by-Step Derivation
0ms Precomputed
Tactical Insight (Hint 1)

Rely strictly on explicit statements in the passage. Eliminate any option that requires external assumptions or twists the author's stated nuance.

Elimination Framework (Hint 2)

Elimination Strategy: In digital reading/writing, 3 out of 4 choices contain an active flaw (half-right/half-wrong, too extreme, or wrong transition type). Cross out options with absolute words like "always", "proves", or "never".

Masterclass Solution & Distractor Trap Analysis

This is a high-level logical reasoning question wrapped in a scientific scenario. We need to resolve a paradox. Let's trace the causal chain in the prompt. Wolves eat elk. Fewer elk means less grazing on willows. Less grazing means willows ...

Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...

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