What causes bioluminescence in marine organisms?

Bioluminescence in marine organisms is caused by a chemical reaction between a substance called luciferin and an enzyme called luciferase. When these substances react in the presence of oxygen, light is produced. This natural light is used by marine organisms for various purposes, including attracting mates, luring prey, and communicating with others. Some deep-sea creatures, like anglerfish and certain species of squid, rely on bioluminescence to survive in the dark depths of the ocean where sunlight doesn’t penetrate.