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The Five-Supergroup Classification Criterion

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Current classification sorts Eukarya, including all protists, into five proposed supergroups by shared cell-structural criteria — a hypothesis this scheme may revise.

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Each supergroup is defined by how its members' nucleus, cytoskeleton, or endosymbiotic organelles diverge from the ancestral pattern.

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This course teaches the defining criteria for membership, not a fixed final tree — the scheme itself states it may revise.

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