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Set 2: Command of Evidence (Intermediate)

Explanation

Answer: A

PASSAGE

Researchers studying coral bleaching found that corals in warmer waters expel their symbiotic algae faster than those in cooler waters. However, some coral species have shown resilience, retaining their algae even at elevated temperatures. Scientists hypothesize that these resilient corals may have developed through natural selection in historically variable environments.

Which finding would best support the scientists' hypothesis about resilient corals?

A. Resilient corals are found predominantly in regions with historically stable temperatures.✓ Correct
B. Resilient corals are more common in areas that have experienced frequent temperature fluctuations.
C. All coral species respond identically to temperature changes.
D. Coral bleaching is caused solely by pollution, not temperature.

Detailed Explanation

The hypothesis links resilience to 'natural selection in historically variable environments. ' Finding resilient corals in areas with 'frequent temperature fluctuations' (variable environments) supports this.

Key Evidence:

• "natural selection in historically variable environments"

Why others are wrong: A (This would contradict the 'variable environments' hypothesis.), C (This contradicts the observation that some species are resilient.), D (This contradicts the premise about temperature.).

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