Biology / Unit 2 Bio 0245 short lesson, about 20 seconds
Unified Cell Theory
Captions available
The idea
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.
In practice
Schleiden and Schwann proposed it in the 1830s from tissue studies; Virchow's work reinforced the third claim.
Where people slip
This is the confirmed sense of theory locked at Bio 0034 — not a hunch.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
Unlocks
- Nothing yet depends on this.
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