Why is the earthworm called the friend of the farmer?

  • A
    They help in pollination of crops.
  • B
    They make the soil porous and increase its fertility.
  • C
    They kill harmful pests in the soil.
  • D
    They provide nitrogen directly to the plant roots.

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What does the part labeled "a" in the given figure represent?

The first segment of the earthworm is called:

In $Pheretima$,sperms are stored in the............

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