A) Hydra and Aurelia
B) Taenia and Ascaris
C) cockroach and Pila
D) Balanoglossus and Herdmania
Correct Answer: C
Solution :
Haemocoel is a cavity formed by combination of many sinuses and filled with haemolymph. in which the viscera are embedded as in cockroach. So, in cockroach open type of blood vascular system is present. This cavity i.e., haemocoel is present in members of phylum Arthropoda like cockroach and phylum moltusca like Pila.
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