* Cells don't spontaneously arise: They don't just appear out of thin air.
* All life on Earth traces back to a common ancestor: Because every cell comes from another cell, the cells we see today are descendants of a single, original cell that arose billions of years ago.
However, the cell theory doesn't tell us how the first cell came to be. That's still a matter of scientific inquiry and ongoing research. Theories about the origin of life focus on the formation of organic molecules from inorganic matter under the conditions of early Earth.
In summary, the cell theory helps us understand the lineage of cells, but it doesn't explain the origin of the first cell itself.
