Which of the following has open circulatory system?

Earthworm

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Cockroach

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Snail

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Both B and C

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Solution

The correct option is D Both B and C
Earthworm belongs to phylum annelida. Cockroach belongs to phylum Arthropoda. Snail belongs to phylum mollusca. In arthropods, the circulatory system is of open type. In annelids blood circulates in blood vessels and so circulation is of closed type. In molluscs, except for some animals, the circulatory system is of open type.
So, the correct answer is option D.

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