Biology / Bio 0245 · Atom · ~20 seconds

Unified Cell Theory

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Unified cell theory holds that living things are made of cells, the cell is life's basic unit, and new cells arise only from existing cells.

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Schleiden and Schwann proposed it in the 1830s from tissue studies; Virchow's work reinforced the third claim.

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This is the confirmed sense of *theory* locked at Bio 0034 — not a hunch.