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Haemocyanin is the pigment carrying O2 in molluscs. Annelids have erythrocruorin.

1. a) True for both
2. b) True for molluscs only
3. c) True for annelids only
4. d) True for neither

Correct answer: a) True for both

Solution

Haemocyanin is the oxygen-carrying pigment in molluscs, and erythrocruorin is the oxygen-carrying pigment in annelids. Since both statements are correct, the option saying both are true is right.

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