Diatom Cell Walls (Frustules): Diatoms have unique cell walls, often referred to as frustules, which are composed of transparent, hydrated silica (SiO 2 .nH 2 O).

Structure: They consist of two interlocking halves (epitheca and hypotheca) that fit together like a soapbox.

Durability: Because silica is inorganic and highly resistant to decay, these cell walls accumulate on the ocean floor to form diatomaceous earth over geological time.

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