Which of the following organism lacks open circulatory system?

House fly

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Cockroach

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Silver Fish

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Earthworm

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Solution

The correct option is D Earthworm
Housefly, cockroach, and silverfish are all Arthropod animals. Arthropods have an open blood circulatory system where the blood is pumped into haemocoel which is a body cavity. The tissues are in direct contact with the blood. Earthworm is an Annelida animal. Annelids have closed circulatory system where the blood is circulated in closed blood vessels. So, the correct answer is option D.

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