Mollusca has ........... type of vascular system.

Reduced

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Open

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Closed

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Absent

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Solution

The correct option is B Open
Molluscs possess an open circulatory system or open vascular system in which body fluid or hemolymph is transported largely within the sinuses devoid of distinct epithelial walls. They have haemocyanin which is present in the blood plasma that helps in gaseous exchange. So, the correct answer is option B.

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