- Corals live in a symbiotic relationship with algae called zooxanthellae, which reside in their tissues and provide them with food and their vibrant colors. - When corals are stressed (e.g., by increased water temperature, pollution, or changes in light), they expel these algae. - Without the zooxanthellae, the coral's white skeleton becomes visible through the transparent tissue, causing it to appear "bleached." The coral also loses its primary food source, making it vulnerable to starvation and disease. - Option B describes impacts on the fishing industry, which is unrelated to the biological process of coral bleaching.