A) supra oesophageal
B) lateral oesophageal
C) dorsal blood
D) subneural
Correct Answer: C
Solution :
In Pheretima posthuma, the dorsal blood vessel is considered as dorsal tubular heart. This blood vessel is a collecting blood vessel behind 13th segment while in initial 13 segment , it works as the distributing vessel. The blood flows in it from backward to forward.
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