(C) Diatoms have cell walls that are embedded with silica,making them indestructible. Over billions of years,these cell walls accumulate at the bottom

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Diatomaceous earth (Kieselguhr)

(C) Diatoms have cell walls that are embedded with silica,making them indestructible. Over billions of years,these cell walls accumulate at the bottom of the ocean or lakes to form large deposits. This accumulation is known as diatomaceous earth or $Kieselguhr$. It is used in polishing,filtration of oils,and syrups.