When the ocean absorbs atmospheric $ ext{CO}_2$ and the pH is pushed too low, which group of organisms is directly threatened?
Answer
Calcifying organisms like corals, shellfish, and plankton
As the ocean's pH lowers due to $ ext{CO}_2$ absorption, it threatens organisms that rely on calcium carbonate to build shells or skeletons, such as corals, shellfish, and plankton, which form the base of many marine food webs.
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