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Q.

Which one of the following has an open circulatory system?

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a

Pheretima

b

Periplaneta

c

Nereis

d

Octopus

answer is B.

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Detailed Solution

Periplaneta is an arthropod. Arthropods exhibit open circulatory system.

Pheretima and Nereis are belonged to Annelida where closed circulation is common.

Though molluscs are provided with open circulation, the cephalopods like Octopus exhibit closed circulation.

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