Archaea, dinoflagellates, and euglenoids are the likely organisms discussed in the question and their characteristics.
Archaea are the organisms most likely found in extreme environments, as they are tolerant and lack most internal organelles. They are distinct from bacteria and more closely related to eukaryotes like fungi. Archaea have unique features that enable them to thrive in harsh conditions.
Dinoflagellates are unicellular organisms that exhibit mitochondrial remnants with reduced functionality. They possess numerous flagella and show a greater genetic difference from other organisms, dating back over a billion years.
Euglenoids are eukaryotic organisms that are predominately unicellular and possess remarkable internal organization, including organelles like an eye spot and contractile vacuole. They demonstrate coordinated movement through flagella and altering the form of their cellular body.
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