What is the nature of cell-walls in diatoms?

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(B) The cell walls of diatoms are composed of silica,which makes them indestructible.Their cell wall structure is known as a $frustule$.It consists of

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They are made of silica.

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(B) The cell walls of diatoms are composed of silica,which makes them indestructible.Their cell wall structure is known as a $frustule$.It consists of two thin overlapping shells that fit into each other like a soap box.When diatoms die,the silica in their cell walls accumulates over billions of years to form $diatomaceous$ $earth$.This $diatomaceous$ $earth$ is gritty,soft,and chemically inert,making it useful for the filtration of oils,syrups,and various industrial applications.

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