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Diatom cell walls are indestructible because they are embedded with:

AChitin
BCellulose
CCalcium
DSilica
Answer & Solution
Correct answer: D. Silica
1. The walls fit like a soap box. 2. Silica makes them indestructible. 3. Deposits form diatomaceous earth. _Source: syllabus Biology, Chapter 2, Biological Classification._
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