Soap box-like overlapping shells are found in the cell walls of

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Diatoms are a group of photosynthesizing algae (chrysophytes) that are found in freshwater as well as in marine waters. Diatoms have soapboxes like overlapping thin shells found in the cell wall. These walls are resistant to destruction as they are made of silica, which is also known as a frustule. Due to this characteristic feature of diatoms, the accumulation of their cell wall deposits is known as "diatomaceous earth".