A) Hydra and Aurelia
B) Taenia and Ascaris
C) Cockroach and Pila
D) Balanoglossus and Herdmania
Correct Answer: C
Solution :
Haemocoel is the body cavity which is filled with blood. It is well developed in arthropodes (.e.g., cockroach) and molluscs (,e.g., Pila).
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