IELTS READING MODULE (GT TEST 4) READING PASSAGE 1 (Biology): The Secret World of Coral Reefs Coral reefs have long been called the “rainforests of the sea” due to their rich biodiversity and ecological significance. Despite covering less than 1% of the ocean floor, these remarkable ecosystems support roughly 25% of all marine species. The … Continue reading  IELTS READING MODULE (GT TEST 4)