Numerical answer
Five sentences related to a topic are given below. Four of them can be put together to form a coherent, meaningful paragraph. Identify the sentence that does not fit.
1. Coral reefs occupy less than one percent of the ocean floor yet support roughly a quarter of all known marine species.
2. This disproportionate richness arises because reefs provide complex, three-dimensional habitat structure that is otherwise scarce in open water.
3. The Great Barrier Reef, stretching over 2,300 kilometres, is visible even from low Earth orbit.
4. Fish, molluscs and crustaceans all depend on the nooks and crevices of reef structures for shelter from predators.
5. Rising ocean temperatures now threaten this habitat complexity by triggering coral bleaching events that strip reefs of their structural integrity.
1. Coral reefs occupy less than one percent of the ocean floor yet support roughly a quarter of all known marine species.
2. This disproportionate richness arises because reefs provide complex, three-dimensional habitat structure that is otherwise scarce in open water.
3. The Great Barrier Reef, stretching over 2,300 kilometres, is visible even from low Earth orbit.
4. Fish, molluscs and crustaceans all depend on the nooks and crevices of reef structures for shelter from predators.
5. Rising ocean temperatures now threaten this habitat complexity by triggering coral bleaching events that strip reefs of their structural integrity.
Show answer and solution
Answer: 3
Sentences 1, 2, 4 and 5 build a single coherent argument about why reefs support disproportionate biodiversity (1, 2), how that structure benefits specific organisms (4), and the threat now facing it (5). Sentence 3, a standalone fact about the Great Barrier Reef's size and visibility from orbit, does not connect to this thread about biodiversity and habitat complexity, so it is the odd one out.
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