Molluscs have

3-4 pairs of hearts

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A single tubular heart

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2-3 chambered heart

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Multichambered heart

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Solution

The correct option is D 2-3 chambered heart
Molluscs have open circulatory system and have single blood flow where only part of blood flow is contained in vessels. Molluscs have 3 chambered heart with 2 atria and 1 ventricle. The heart pumps oxygenated blood from the gills.
So, the correct answer is (C)

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