(C) Diatoms are microscopic algae that have cell walls composed of silica $(SiO_2)$.When these organisms die,their cell walls accumulate at the bottom

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(C) Diatoms are microscopic algae that have cell walls composed of silica $(SiO_2)$.When these organisms die,their cell walls accumulate at the bottom of oceans and lakes over millions of years.This accumulation forms a sedimentary rock known as diatomaceous earth,which is rich in silicon.