medium · SAT Reading & Writing
The use of bioluminescence in marine organisms, such as the deep-sea anglerfish, serves several critical functions. Some species use light to attract prey, while others use it as a form of counter-illumination to hide from predators by matching the dim light filtering down from the surface. Thus, bioluminescence is not merely a decorative trait but a ____ tool for survival in the aphotic zone. Which choice completes the text with the most logical and precise word or phrase?
- primitive
- versatile
- redundant
- conspicuous
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