Which of these statements about light microscopes and electron microscopes is not true?
a. you can use light microscopes to observe both living and nonliving cells; you can use electron microscopes to observe only nonliving cells.
b. light microscopes use visible light rays; electron microscopes use beams of electrons.
c. preserving and staining samples for use with light microscopes is necessary; preserving and staining samples for use with electron microscopes is optional.