Pheretima posthuma is highly useful as

[A] Their burrows make the soil loose

[B] They make the soil porous, leave their castings and take organic debris in the soil

[C] They are used as fish meal

[D] They kill the birds due to biomagnification of chlorinated hydrocarbons

Answer & Explanation
Answer: They make the soil porous, leave their castings and take organic debris in the soil