Arrange the sentences into a coherent paragraph:
[1] By sequestering atmospheric carbon dioxide in limestone shells, marine calcifiers stabilize global planetary temperatures.
[2] Phytoplankton, coccolithophores, and foraminifera extract dissolved calcium and carbonate ions from seawater.
[3] When these microscopic organisms die, their skeletal shells drift downward to form thick chalk beds on the ocean floor.
[4] Over geological epochs, tectonic subduction recycles these carbonate sediments into mantle volcanic gases.
Answer and explanation
Correct answer: D. 2 - 3 - 1 - 4
- Step 1: Sentence 2 establishes the biological process: marine calcifiers like corals and mollusks extracting calcium and carbonate to construct shells.
- Step 2: Sentence 3 describes their deposition onto the ocean floor upon dying. Sentence 1 details their incorporation into sedimentary limestone beds over geologic time, and Sentence 4 concludes with their role as long-term carbon sinks.
- Step 3: The coherent logical sequence is 2 - 3 - 1 - 4.
Answer
2 - 3 - 1 - 4.
Why not the others: 1 - 2 - 3 - 4 asserts global temperature stabilization before describing the biological calcification mechanism; 3 - 1 - 4 - 2 starts with post-mortem sinking of shells before identifying the organisms that build them; 2 - 1 - 3 - 4 discusses long-term climatic impacts before explaining shell deposition on the seabed.
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