Numerical answer
Four of the five sentences below, when arranged in the right order, form a coherent paragraph. Identify the ONE sentence that does not fit and enter its number as the answer.
1. Coral reefs occupy less than one percent of the ocean floor yet support roughly a quarter of all known marine species.
2. Rising sea temperatures cause corals to expel the algae living in their tissues, a process known as bleaching that can be fatal if prolonged.
3. Many coastal communities depend on reef fisheries for both nutrition and income, making reef health a matter of direct economic concern.
4. Deep-sea mining operations have expanded significantly over the past decade in search of rare earth minerals.
5. Marine biologists have begun cataloguing heat-resistant coral strains in the hope of using them to help reefs recover after bleaching events.
1. Coral reefs occupy less than one percent of the ocean floor yet support roughly a quarter of all known marine species.
2. Rising sea temperatures cause corals to expel the algae living in their tissues, a process known as bleaching that can be fatal if prolonged.
3. Many coastal communities depend on reef fisheries for both nutrition and income, making reef health a matter of direct economic concern.
4. Deep-sea mining operations have expanded significantly over the past decade in search of rare earth minerals.
5. Marine biologists have begun cataloguing heat-resistant coral strains in the hope of using them to help reefs recover after bleaching events.
Show answer and solution
Answer: 4
Sentences 1, 2, 3 and 5 form a coherent discussion of coral reefs — their ecological importance, the threat of bleaching, the economic stakes, and current conservation research. Sentence 4, about deep-sea mining for rare earth minerals, is unrelated to this thread and is the odd one out.
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