You are presented with the question "Cells vary in size as well as shape and are seen with what?" and the following answer choices: 
- Electrical energy
 - by indirect light
 - camera lenses
 - a microscope
 - a telescope
 - colors
 - bright lights
 - rays or beams

Now knowing that 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, choose the best answer.


 

    a microscope     