Cell theory is a fundamental principle in biology that outlines the basic structure and function of all living organisms. It consists of three main parts:
-
All living organisms are composed of one or more cells: This means that every form of life, from simple bacteria to complex multicellular organisms like humans, is made up of cells, highlighting the cell's role as the basic unit of life.
-
The cell is the basic unit of structure and organization in organisms: Cells are not only the building blocks but also the functional units of life, responsible for carrying out essential processes necessary for an organism's survival and growth.
-
All cells arise from pre-existing cells: This principle emphasizes that new cells are produced through the division of existing cells, reinforcing the cycle of cellular life and development, and underscoring the continuity of life through cellular replication.