[2026] PTE Academic Reading - Multiple Choice, Multiple Answers

Bioluminescence is the production and emission of light by a living organism, a phenomenon commonly observed in deep-sea environments.Many marine creatures, such as anglerfish, use their light to attract prey or deter potential predators.The process involves a chemical reaction between a light-emitting molecule, luciferin, and an enzyme, luciferase.While some animals produce this light themselves, others enter into symbiotic relationships with bioluminescent bacteria, providing them with shelter and nutrients in exchange for illumination.This biological light serves as a vital adaptation for survival in the deep ocean, where sunlight cannot reach and darkness is total.