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Many different cells can live on their own and in many different ways. Unicellular algae and phytoplankton are single celled autotrophs (make their own food) that are photosynthetic. Yeast, used in baking and brewing, is a fungus that eats sugars and produces CO2 (causes bread to rise) and alcohol. There is also a whole kingdom called Protista that is mostly unicellular, which includes amoebas, parameciums, euglenas and many more with widely varying methods of survival. Some can be plant-like (euglena), animal-like (paramecium and amoebas), and fungus-like (slime molds). There are even protists that eat other protists! There are many possibilities!

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14y ago

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