The four sentences (labelled 1, 2, 3 and 4) given below, when properly sequenced, would yield a coherent paragraph. Decide on the proper sequencing of the order of the sentences and key in the sequence of the four numbers as your answer. 1. The mechanism is now well understood: when seawater stays even slightly warmer than usual for several weeks, the coral animals expel the algae they live with and slowly starve. 2. Across the tropics, the world's coral reefs are dying at a rate without precedent in the geological record we have managed to read. 3. In the summer of 2016, a single such heat episode killed almost a third of the Great Barrier Reef — a loss measured not in patches but in hundreds of kilometres. 4. Reefs cover less than one per cent of the ocean floor but shelter a quarter of all marine species, so what we are watching may be the most concentrated extinction of our lifetimes.
how can the answer of this question be 2314 can anybody explain
2 Answers
The Clouds · 2026-07-15 · 2 helpful
2431
Aarav · 2026-07-15 · 1 helpful
The correct order is 2314 because the paragraph follows a natural flow: introduce the topic → give an example → explain the reason → end with the conclusion.
Sentence 2 comes first because it introduces the main idea that coral reefs across the tropics are dying at an unprecedented rate. Once the problem is introduced, sentence 3 gives a real-life example by describing how a heat episode in 2016 killed almost one-third of the Great Barrier Reef.
After mentioning this heat episode, sentence 1 naturally explains how it happened by describing the mechanism: when seawater remains warmer than usual for several weeks, corals expel the algae they depend on for food and slowly starve.
Finally, sentence 4 works as the conclusion because it explains why the issue is so serious. It points out that although coral reefs cover less than one percent of the ocean floor, they support about a quarter of all marine species, making their destruction one of the most concentrated extinction events of our lifetime.