In molluscs, closed circulatory system is found in the class(es):I. bivalviaII. gastropodaIII. cephalopoda
Correct answer: B. III only
- A. I only
- B. III only
- C. I and II
- D. II and III
Explanation
In the phylum Mollusca, the class Cephalopoda, which includes organisms such as octopuses and squids, is unique for having a closed circulatory system. This means their blood is contained within vessels, which allows for more efficient oxygen and nutrient transport.
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