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At the cellular level, living things can be divided into two basic groups: the prokaryotes—without a distinct nucleus and membrane-bound organelles—and the eukaryotes—cells that do possess a distinct nucleus and membrane bound organelles. In this set, the prokaryotes are represented by the cyanobacterium Gloeocapsa and by bacteria—three forms mixed. The eukaryotes are represented by the evolutionarily intermediate Euglena and by the large and easily studied liver cells of the Congo eel Amphiuma; four slides total.