Cells vary in size as well as shape, but all cells are very small, and most cells are too small to be seen without a microscope. Given these facts, cells vary in size as well as shape and are seen with what among the following options:
- Electrical energy
 - by indirect light
 - camera lenses
 - a microscope
 - a telescope
 - colors
 - bright lights
 - rays or beams


 

    a microscope     