the discovery of the atom. better surgical techniques. continued experimentation. the invention of the microscope.
I gave my students this multiple choice question: It was once thought that living organisms could come from non-living matter. For example, people believed that flies would develop from rotting meat. This idea was later disproved primarily because of

Only one answer is correct among these 4 choices:
- the discovery of the atom.
- better surgical techniques.
- continued experimentation.
- the invention of the microscope.

Could you tell me which one is correct?

continued experimentation.