Final answer:
The cell theory in biology explains that all living organisms are made up of cells, emphasizing their essential role as the smallest functional unit in life.
Explanation:
Cell theory is the most accepted theory regarding the make-up of living things in biology. It states that all living organisms are composed of cells as the smallest functional unit, and living cells always come from other living cells. This theory explains the historic continuity of organisms and plays a crucial role in understanding the fundamental building blocks of life.
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