Why is ocean acidification problematic for some marine life?
A. It decreases the stratification of water temperatures, so that marine organisms have smaller ranges in which to survive.
B. It decreases the availability of oxygen in the water for the respiration needs of aquatic organisms.
C. The acidification causes metals to precipitate out of the water and deposit on the backs of aquatic organisms.
D. It decreases the amount of carbonate in the oceans, making the creation of shells and other hard structures difficult for marine life.
Answer: D
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