A) Mollusca -Pseudocoel
B) Cnidaria - Nematocyst
C) Annelida - Chloragogen cells
D) Echinodermata - Water vascular system
Correct Answer: A
Solution :
Haemocoel is the body cavity of molluscs which contains blood. Pseudocoel is a fluid-filled cavity found between body wall and alimentary canal. Pseudocoel is a persistant blastocoel, lacking a definite mesoderm layer.
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