A) hirudina
B) polychaeta
C) oligochaeta
D) all of these.
Correct Answer: A
Solution :
: Hirudina (leech) belongs to the class hirudinea, phylum annelida. They are sanguivorous (feed on blood) ectoparasites. The space between body cavity and food pipe is filled with botryoidal tissue. Botryoidal tissue is a pigmented and richly vascular masses of connective tissue. These tissue and excretory in functions.
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