Multiple choice

The smallest shell in the world is

  1. pisidium

  2. podium

  3. pevelium

  4. rhodium
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A Correct answer
Explanation

Pisidium is a genus of very small freshwater clams, with some species having shells measuring only 1-2mm, making them among the smallest shells in the world. The other options are either misspellings or incorrect terms: rhodium is a chemical element, not a shell.

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