Which of the following is unique to the molluscs and has no equivalent in any other animal?

1. Haemocoel 2. Hemocyanin
3. Radula 4. Metamerism
Subtopic:  Phylum Mollusca |
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Identify the incorrect statement regarding Mollusca:
1. It is the second largest animal Phylum after Phylum Arthropoda.
2. It includes animals that are bilaterally symmetrical, triploblastic, and coelomate.
3. Body is covered with a calcareous shell and is metamerically segmented with a distinct head, muscular foot, and visceral hump.
4. Gills are present in the mantle cavity, a space between the mantle and the hump.
Subtopic:  Phylum Mollusca |
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Please attempt this question first.
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