Here's why:
* SEMs use a beam of electrons to scan the surface of a sample. The electrons interact with the sample, producing signals that are then used to create an image. This technique provides detailed, three-dimensional information about the surface topography.
Other types of microscopes are designed to look *inside* cells, not just at the surface:
* Light Microscopes use visible light to illuminate the sample. They are limited in resolution and can only see larger structures within a cell.
* Transmission Electron Microscopes (TEMs) also use electrons, but they pass through the sample. This allows for the visualization of internal structures but requires very thin slices of the cell.
So, to see the surface of a cell, you would use a Scanning Electron Microscope.
