Many of the sea's creatures produce light through bioluminescence. A. Bioluminescent creature use a substance called luciferin and an enzyme to produce light in a biologically driven chemical reaction. B. Bioluminescence can be used to achieve various and sometimes seemingly opposite goals such as frightening away predators or luring prey. C. Bioluminescence can be used by some sea creatures as a form of communication or as a means of identifying an appropriate mate. D. The majority of bioluminescent creatures are gelatinous in nature, allowing them to produce light. E. The same bioluminescent creature cannot have both light-sensing and light-producing organs. F. Sea creatures that eat bioluminescent material possess special chemicals that keep their stomach contents from flashing.