ISEE Lower Level Reading Comprehension Quiz
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In the deepest parts of the ocean, sunlight cannot reach, and the world is in constant darkness. Yet, this dark world is filled with light created by the animals that live there. This phenomenon is called bioluminescence. It is a 'cold light' because it produces very little heat, making it a very efficient process. Creatures like the anglerfish have a glowing lure that dangles in front of their sharp teeth to attract unsuspecting prey. Others, like the firefly squid, can release a cloud of glowing ink to startle and confuse predators, allowing for a quick escape. The light itself is the result of a chemical reaction inside the animal's body, involving a substance called luciferin. When luciferin combines with oxygen, it creates light. This ability is not just for hunting or defense; many deep-sea animals use their unique light patterns to communicate with each other or to find mates in the vast, dark expanse of the deep ocean.
The idea that creating light is an energy-efficient action for these creatures is best supported by which detail?
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