Final answer:
The cell theory, central to biology, asserts that organisms are made of cells, cells are the basic unit of life, and new cells arise from existing cells.
Step-by-step explanation:
The cell theory is a fundamental principle in biology, which was developed from the work of scientists Theodor Schwann, Matthias Schleiden, and Rudolf Virchow. This theory outlines the importance of cells as the foundation of all living organisms. Here are the three core principles:
- All organisms are composed of one or more cells.
- Cells are the basic unit of structure and function in all living organisms.
- All cells originate from pre-existing cells, confirming the principle of biogenesis.
Cells not only form the physical structure of an organism but also are crucial for carrying out life processes. In addition, the fact that cells divide to reproduce ensures the continuity of life, making it a central theme in the study of biology.