Explanation:
They form the base of the food chains/ webs for the marine ecosystems. These microorganisms are the most abundant in the oceans. They are preyed on by the small fish and the small fish are later preyed in by bigger fishes and so on..These micro-organisms are therefore critical in nutrient cycling in the oceans. Without them, there would be dead zones in the oceans.
Learn More:
For more on nutrient cycling in oceans check out;
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