Choose the correct statements regarding Molluscs.
I. digestive tract is a complete and complex with ciliary tracts for sorting small particles
II. respiration takes place by one to many uniquely structured ctenidia
III. circulatory system is closed type and typically includes a dorsal heart
IV. excretion takes place by flame cells or green glands

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Only statement IV

Statement I and III

Statements I, II and IV

Statements I and II

answer is B.

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Detailed Solution

In mollusks circulatory system is open type and typically includes a dorsal heart,

excretion takes place by metanephridia.

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