Question

what factor is contributing the most to the decline of coral reefs in oceans? decreased ocean pollution cooler ocean temperatures increased ocean acidity reduced harmful radiation

Explanation:

To determine the factor contributing most to coral reef decline, we analyze each option:

• "decreased ocean pollution" would help, not harm, corals.
• "cooler ocean temperatures" is incorrect as coral bleaching is linked to warming, not cooling.
• "increased ocean acidity" (from rising CO₂ absorption) harms corals’ ability to build skeletons, a major decline driver.
• "reduced harmful radiation" would benefit, not harm, corals.

Answer:

C. increased ocean acidity