"An amoeba is not visible to the naked eye. So ''several milimeters'' is out of the question." I should think so, too, but here's the reference, and it looks like a reliable source: William R. Pendergras. Carolina protozoa and invertebrates manual: Carolina biological supply company, 1980. "Most protozoans are microscopic, but certain amoebae reach up to 4 to 5 mm in diameter, and the shells of their cousins the foraminifera may be 10 cm across." Meh. Who can be sure of anything anymore...? Have fun!
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