Which one of the following has an open circulatory system?

Hirudinaria

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Octopus

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Pheretima

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Periplaneta

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Solution

The correct option is D Periplaneta
Hirudinaria and Pheretima both are Annelids. Members of phylum Annelida have closed circulatory system. Octopus belongs to phylum Mollusca. Octopus has a closed circulatory system. Periplaneta is a common cockroach and belongs to phylum Arthropoda. In Arthropods circulatory system is of open type.
So, the correct answer is option D.

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