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Spirulina is a microbe that can be used for reducing environmental pollution.
Reason: Spirulina is a rich source of protein, carbohydrates, fats, minerals and vitamins.
Detailed Solution
Spirulina can be grown on waste water from potato processing plants, straw, molasses etc., thereby reducing environmental pollution - the assertion is correct. It is also a rich source of protein, carbohydrates, fats, minerals and vitamins - the reason is correct, but it does not explain the assertion.