what is leech

1.	what is leech
Answer» Leeches are types of worms. Their closest relatives are earthworms. There are over 650 species of leeches. They differ in size, type of diet and habitat. Leeches usually inhabit marshes, rivers and ponds. One fifth of all leeches live in the sea, while certain species live attached to the forest vegetation. It is used for several medical procedures.

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