Main Idea of Coral Reef Lecture
In a recent lecture about the impact of climate change on marine ecosystems, the professor emphasized how rising sea temperatures affect coral reefs. She explained that as water warms, corals expel the algae that live in their tissues, leading to a process known as bleaching. This not only affects the corals’ ability to gain nutrients but also disrupts the entire ecosystem that depends on these reefs for shelter and food. In addition, the lecture highlighted the implications for fisheries and tourism, which rely heavily on healthy marine environments. The professor concluded by urging for immediate action to mitigate climate change and protect these vital ecosystems.
Note: This question has been adapted from its original format to accommodate a reading-based version. In the official TOEFL exam, speaking and listening sections require verbal responses and audio prompts, which are not represented here. Please note that this adaptation may not fully reflect the nature or difficulty of the official exam. The audio feature for these sections will be available soon.