How are earthworms useful to farmers?

They help in nitrogen fixation in the soil.

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They help in killing pests.

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They make the soil airy, soft and fertile.

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They help in pulling out of weeds.

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Solution

The correct option is C They make the soil airy, soft and fertile.
Earthworms improve the physical structure of the soil by improving water filtration and absorption rates and improving soil aeration, porosity and permeability by tunneling.

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