All cells come from<span> pre-existing </span>cells<span> by </span>cell<span> division. Schwann also proposed “Free</span>Cell<span> Formation” or spontaneous generation of </span>cells<span> — this was before Pasteur's definitive experiments. Modern </span>Cell Theory<span> Also States: Life's chemical processes, such as metabolism, occur inside of </span>cells. hope this helps
According to the cell theory all living cells come from living cells by multiplying. The cell theory states that: All living things are made up of cells. Cells are the basic unit of living things.