Read the scientific report: 'Endemic fauna in the Philippine archipelago exhibit exceptionally high rates of species turnover across island groups. Pleistocene sea-level drops connected some modern islands via land bridges, while deep trenches kept oceanic islands permanently isolated, fostering distinct evolutionary radiations.'\nWhat biogeographical phenomenon explains the distinct island fauna?
Answer and explanation
Correct answer: C. fluctuating glacial sea levels creating temporary land connections alongside permanent ocean barriers
- Step 1: The passage attributes species patterns to sea-level fluctuations connecting some islands while deep marine barriers kept others isolated. Answer: fluctuating glacial sea levels creating temporary land connections alongside permanent ocean barriers. Why not the others: Speciation was driven by isolation and land bridges, not Spanish introductions.
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