which type of microscope was the first to be used for studying single - celled organisms?\no simple…

which type of microscope was the first to be used for studying single - celled organisms?\no simple microscope\no tunneling microscope\no compound light microscope\no electron microscope
Answer
Brief Explanations:
The simple microscope was the earliest type used for studying single - celled organisms. It uses a single lens for magnification. Tunneling microscopes, compound light microscopes, and electron microscopes were developed later.
Answer:
simple microscope