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Q: When a cuttlefish is described as a mollusca, it is at which level of classification?
  • A. Class
  • B. Order
  • C. Family
  • D. Phylum
Correct Answer: Option D - Cuttlefish or cuttles are marine molluscs of the order sepiida. Sepia is a genus of cuttle fish. In phylum mollusca, three most universal features defining modern molluscs are a mantle with a significant cavity used for breathing and excretion, the presence of a radula and the structure of nervous system. The shell are made up of proteins and chitin reinforced with calcium carbonate.
D. Cuttlefish or cuttles are marine molluscs of the order sepiida. Sepia is a genus of cuttle fish. In phylum mollusca, three most universal features defining modern molluscs are a mantle with a significant cavity used for breathing and excretion, the presence of a radula and the structure of nervous system. The shell are made up of proteins and chitin reinforced with calcium carbonate.

Explanations:

Cuttlefish or cuttles are marine molluscs of the order sepiida. Sepia is a genus of cuttle fish. In phylum mollusca, three most universal features defining modern molluscs are a mantle with a significant cavity used for breathing and excretion, the presence of a radula and the structure of nervous system. The shell are made up of proteins and chitin reinforced with calcium carbonate.