write 3 useful and 3 harmful effect of algae.
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3 useful effects are
They are used as a thickening agent.
Sea weed, a type of algae is edible and can be eaten by us.
Algae is also used in paints, cosmetics, leather etc.
3 harmful effects are
They block the penetration of sunlight in water and also cut the contact of aquatic organisms from atmosphere which can prove fatal for their health causing eutrophication
Algae releases harmful wastes and toxics in water thereby polluting it.
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