Which microscope did anton van leeuwenhoek use to observe single-celled organisms? a. simple microscope b. compound light microscope c. electron microscope d. tunneling microscope

The microscope that Anton van Leeuwenhoek used to view the single - celled microorganism is made up of 2 or more lenses but were refined glasses made from finely ground lenses. This microscope is not entirely compound as its components are only those that are mentioned above. Thus, the answer is letter A. simple microscope. 

a. simple microscope

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