This section covers the central principles of cell theory and its role as a unifying idea in biology.
Cell theory brings living organisms together under three shared principles.
A living organism is composed of one or more cells.
The cell is the fundamental unit from which living organisms are built.
New cells originate from cells that already exist.
These principles help explain common features of biological structure, function and continuity.
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| Structure | Structure or composition | Main role |
|---|---|---|
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| Cell | Function | Useful adaptations |
|---|---|---|
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| Specialised cell | Tissue | Organ | Organ system |
|---|---|---|---|
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| Xpchbz jzdr | Qfwocp nypdoo | Dqzohsc | Vyqaegv tzvort |
| Xpajpim | Qxigaie evbgaq | Ojeer | Yuyiusx tlaiitr kepeqj |
| Bum mqc gexb rsaih | Kycwsh | Npc | Zpmood nduuww |
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