If a researcher determines an organism to be eukaryotic, unicellular, and autotrophic, then this organism is a Protista. These organisms are algae.
Algae are organisms that can be classified as eukaryotic, unicellular, and autotrophic, belonging to the Protista group.
Algae are generally aquatic (marine) photosynthetic organisms that belong to the kingdom Protista.
Protista is a eukaryotic kingdom that includes plant-like protists (algae) and different protozoans.
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