Which of the following species has been used for centuries to draw blood from areas swollen by poisonous stings and bites?

A) polychaetes
B) leeches
C) tapeworms
D) hookworms
E) earthworms

Leeches

Parasitic or predatory worms belonging to the phylum Annelida and known for their use in medicine, especially for bloodletting.

Polychaetes

A class of annelid worms, characterized by having many legs or bristles, often living in marine environments.

Tapeworms

Parasitic flatworms that live in the digestive tract of vertebrates, absorbing nutrients from the host's intestine.