The theory of spontaneous generation stated that
| 1. | life arose from living forms only |
| 2. | life can arise from both living and non-living |
| 3. | life can arise from non-living |
| 4. | life arises spontaneously, neither from living nor from the non-living. |
Louis Pasteur by careful experimaentation disapproved this theroy and demonstrated that life arose from living forms (pre-existing life.)
