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Diatoms are a major group of algae, and are one of the most common types of phytoplankton. Most diatoms are unicellular, although they can exist as colonies in the shape of filaments or ribbons

The Great Story III An animal cell, a eukaryote.Before the electron microscope, the complexity of subtle structures within the cell was not known. Now we are only beginning to appreciate the complexity of sub-cellular anatomy and physiology!