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

The Great Barrier Reef, the world's largest coral reef system, is composed of over 2,900 individual reefs and stretches for 2,300 kilometers.This vast ecosystem supports an incredible diversity of marine life, including hundreds of species of fish, mollusks, and sea turtles.Despite its size, the reef is extremely fragile and faces existential threats from rising ocean temperatures, which lead to mass coral bleaching.When stressed by heat, corals expel the symbiotic algae living in their tissues, causing them to turn white and lose their primary food source.If these bleaching events occur too frequently, the coral colonies cannot recover, leading to a permanent loss of biodiversity in the region.