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Examine the similarities and differences among the major groups of protists. The five slides selected include Euglena, a mastigophoran (flagellate); Amoeba proteus, a sarcodine; Stentor, a ciliate; Plasmodium, a parasitic sporozoan; and mixed freshwater diatoms, photosynthetic chrysophytes. Relevant comparisons can be made with respect to motility, photosynthetic capability, life history and subcellular structures. The diatoms are included as an intermediate form between protists and higher algae.