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Protozoan are organism, usually single-celled and heterotrophic (using organic carbon as a source of energy), belonging to any of the major lineages of protists and, like most protists, typically microscopic.
Added 3/29/2018 1:36:48 PM
This answer has been confirmed as correct and helpful.
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yumdrea [3/29/2018 1:48:59 PM]
