Define bioluminescence in marine organisms.

Bioluminescence is the production of light by living organisms, a phenomenon that occurs in various marine organisms, including certain species of fish, bacteria, and jellyfish. This ability results from biochemical reactions within the organism, often involving a light-emitting pigment called luciferin and an enzyme called luciferase. Bioluminescence serves multiple ecological functions, such as attracting mates, deterring predators, and aiding in the hunting of prey. It is distinct from other forms of light-related phenomena, like reflection or absorption, emphasizing the unique role of biological mechanisms in generating light.