📊 GMAT Exam Prep

Many species of deep-sea fish have bioluminescent organs that emit light. These organs are thought to be used for attracting prey, signaling to mates, and evading predators. However, because light travels only short distances in the deep ocean, the usefulness of bioluminescence for long-range communication is limited. What can be inferred from the passage?

A Deep-sea fish rely primarily on sight for hunting in their environment.
B Bioluminescence is the only method deep-sea fish use for communication.
C Some forms of bioluminescence are effective only at close range.
D All deep-sea fish possess bioluminescent organs for various purposes.

✓ Correct Answer: Option C

The passage states that 'light travels only short distances in the deep ocean,' directly implying that bioluminescence, which uses light, would only be useful for 'short-range communication' or interactions, thus effective only at close range.

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