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Q.

Which of the following has open circulatory system?

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a

Petromyzon

b

Balanoglossus

c

Pristis

d

Octopus

answer is C.

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Detailed Solution

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Circulatory system is of open type in Balanoglossus (Hemichordata).

Octopus, Petromyzon and Pristis  have closed circulatory system.

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