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Set 4: Command of Evidence (Intermediate)

Explanation

Answer: C

PASSAGE

Ocean acidification occurs when seawater absorbs CO2, forming carbonic acid. This lowers pH, making it harder for corals and shellfish to build shells.

What is the primary cause of ocean acidification?

A. Industrial spills.
B. Absorption of atmospheric carbon dioxide.
C. Agricultural runoff.✓ Correct
D. Overfishing.

Detailed Explanation

Text states acidification occurs when seawater absorbs CO2.

Why others are wrong:

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