No; a single-celled organism is a unicellularoraganism I believe.
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The mechanism by which one small, single-celled organism could
ingest a smaller single-celled organism is phagocytosis.
Phagocytosis is the process of ingesting particles of a cell.
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No, not quite. A bacterium is a single-celled organism, for
sure, but not all single-celled organisms are bacteria.
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a Prokaryote
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A single-celled organism without an organized nucleus is a
prokaryote.