This is a single-celled organism with an ingested, and still alive, microscopic multicellular organism inside its cell. . The single-celled organism is a Stentor. They can grow a few millimeters in length, the largest one I’ve seen was almost as long as a grain of rice. They feed on all sorts of microscopic organisms, and this one swallowed a multicellular organism, a rotifer with organs, a simple brain, muscles, and even two little eyes. . Single-celled organisms can be incredibly complex witho

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