Protozoans

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“Their bodies consist either of aa simple elementary cell, with its contents, or of an aggregation of several of these cells; each, however, still appearing to retain its independent existence. They are generally of a very minute size, and only to be observed with the microscope.” — Goodrich, 1859

Source

S. G. Goodrich Animal Kingdom Illustrated Vol 2 (New York, NY: Derby & Jackson, 1859)

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