Answer:
The development of the cell theory was influenced by continuous investigations and new scientific information. Scientists such as Robert Hooke, Anton van Leeuwenhoek, Matthias Schleiden, and Theodor Schwann made significant contributions to this theory.
1. Robert Hooke, in 1665, observed cork cells under a microscope and coined the term "cell." This discovery laid the foundation for the idea that living organisms are composed of cells.
2. Anton van Leeuwenhoek, in the late 17th century, improved the microscope and observed single-celled organisms like bacteria, protozoa, and red blood cells. His observations supported the concept that cells are the fundamental units of life.
3. Matthias Schleiden, in 1838, proposed that plants are composed of cells. This expanded the understanding of the cell theory beyond simple observations of cork and single-celled organisms.
4. Theodor Schwann, in 1839, extended the cell theory to include animals. He concluded that animals are also made up of cells, similar to plants.
These continuous investigations and new scientific information led to the formulation of the cell theory, which states that all living organisms are composed of cells, cells are the basic units of life, and cells arise from pre-existing cells. This theory revolutionized the field of biology and laid the groundwork for further advancements in the understanding of living organisms.
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