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Pheretima posthuma is highly useful as
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- their burrows make the soil loose
- they make the soil porous, leave their castings and take organic debris in the soil
- they are used as fish meal
- they kill the birds due to biomagnification of chlorinated hydrocarbons
Correct Option: B
Earthworms are very useful to human as they make the soil porous and increase its fertility through worm casting. They are called as Nature’s ‘plough man’.
