Which of the following animals doesn't have blood as circulating medium?
A
Cockroach
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B
Mussel
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C
Leech
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D
Planaria
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Solution
The correct option is C Planaria
Cockroach has haemolymph ( open circulation), Mussel (open circulation ) and Leech (closed circulation ) both open and closed circulation have blood as a circulating medium. Planaria receive oxygen and release carbon dioxide by diffusion.