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Useful actions of algae - class-VIII
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.......... is a source of additional fuel through carbohydrates.
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A
Algae
💡 Explanation:
Algae are photosynthetic organisms related to plants that grow in water and produce energy from carbon dioxide and sunlight. Single-celled microalgae can be used to produce large amounts of fat, which can be converted into biodiesel, the most common form of biofuel. The carbohydrate content of algae can be fermented into bioethanol or butanol fuel.
So, the correct option is 'algae'.