Ocean acidification, primarily caused by the absorption of CO2 from the atmosphere by the ocean, leads to a decrease in the pH of seawater. This process threatens marine organisms that rely on calcium carbonate to build their shells and skeletons, such as mollusks, some plankton, and corals, because the more acidic water dissolves calcium carbonate faster than these organisms can produce it.

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Ocean Acidification

Question 23

Multiple Choice

Ocean acidification

A) threatens animals that build calcium carbonate shells.
B) results from unusually warm seawater temperatures.
C) is a particular issue for cartilaginous fishes such as sharks.
D) is the primary cause of coral bleaching.

Correct Answer: