Question

which microscope did anton van leeuwenhoek use to observe single - celled organisms?
○ simple microscope
○ compound light microscope
○ electron microscope
○ tunneling microscope

Explanation:

Anton van Leeuwenhoek is known for using a simple microscope. A simple microscope has a single lens. He made significant contributions to microbiology by observing single - celled organisms with his simple microscope. Compound light microscopes (with multiple lenses) were developed later. Electron microscopes and tunneling microscopes are much more modern inventions (electron microscopes use electrons instead of light and were developed in the 20th century; tunneling microscopes are even more recent, based on quantum tunneling effects).

Answer:

simple microscope