Chrysophytes, specifically the subgroup known as diatoms, possess cell walls composed of two thin, overlapping shells. These shells, known as the epitheca (upper part) and hypotheca (lower part), fit together exactly like a soap box. Key characteristics include:

Composition: The walls are heavily embedded with silica, making them extremely hard and practically indestructible.

Diatomaceous Earth: Over billions of years, the accumulation of these silica cell walls on the ocean floor forms large deposits called diatomaceous earth.

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