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Which of the following is not the economic importance of fishes?

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source of food

polishing agent

source of vitamin

source of water

answer is D.

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Detailed Solution

Concept: Fish and other aquatic food animals provide a valuable source of nutrition. Fish have a high protein and fat content.

Iodine and other minerals are abundant in fish and other types of seafood.

Vitamins A and D are also abundant in them. It's also used for polishing surfaces and covering particular items.

Hence, option 4 is the correct answer.

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