When protective marine ecosystems absorb carbon dioxide, the water's pH drops, causing a severe threat to shellfish and corals called:

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A Ocean Acidification
B Thermal Expansion
C Eutrophication
D Desalination

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Answer: A. Ocean Acidification

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• Explanation: A) Ocean Acidification is correct because excess atmospheric CO₂ dissolves into seawater to form carbonic acid, hindering shell building.

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When protective marine ecosystems absorb carbon dioxide, the water's pH drops, causing a severe threat to shellfish and corals called:

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