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Professor: Today we're going to discuss a fascinating adaptation in marine biology: bioluminescence. Many deep-sea organisms produce light through chemical reactions, but what's truly remarkable is how they use this light. Some species, like the anglerfish, use a glowing lure to attract prey in the darkness. Others, such as certain squid, eject a cloud of glowing fluid to confuse predators, creating a diversion while they escape. But bioluminescence isn't only for hunting or defense; it also plays a role in communication. For example, some species of fireflies use specific flash patterns to attract mates, and in the ocean, certain shrimp use light signals to coordinate group behavior. Interestingly, scientists have discovered that bioluminescence is more common in the deep sea than in shallow waters, likely because in the dark depths, even a faint light can be a powerful signal. This ability has evolved independently in multiple lineages, showing its importance in survival. Now, let's consider why some organisms might lose this ability over time.