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Which of the following is not a benefit of algae?

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Source of agar – agar (used to grow microbes and used in ice creams and jellies)

About 70 species used as food

They are primary producers and basis of food cycles in dry terrestrial ecosystem

They fix half of the total $C O_{2}$ on earth and increase level of dissolved oxygen in water

answer is C.

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Algae are primary producers and basis of food in aquatic ecosystem.

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