Which of the following organisms add organic | vedclass

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(B) Blue-green algae (cyanobacteria) are autotrophic microbes widely distributed in aquatic and terrestrial environments. Many of these,such as $Anaba

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Blue-green algae

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(B) Blue-green algae (cyanobacteria) are autotrophic microbes widely distributed in aquatic and terrestrial environments. Many of these,such as $Anabaena$ and $Nostoc$,have the ability to fix atmospheric nitrogen. When these organisms die and decompose,they add organic matter to the soil and increase its fertility. Therefore,they are widely used as biofertilizers in paddy fields.

Which of the following organisms add organic matter to the soil and increase its fertility?

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