Which of these statements about light microscopes and electron microscopes is not true?

you can use light microscopes to observe both living and nonliving cells; you can use electron microscopes to observe only nonliving cells.
light microscopes use visible light rays; electron microscopes use beams of electrons.
preserving and staining samples for use with light microscopes is necessary; preserving and staining samples for use with electron microscopes is optional.

halogen, any of the six nonmetallic elements that constitute group 17 (group viia) of the periodic table. the halogen elements are fluorine (f), chlorine (cl), bromine (br), iodine (i), astatine (at), and tennessine (ts).

it also supports my hypothesis. if you rest first you can squeeze the clothespin more times. from the data i collected the average of the eight people concluded exercise makes your muscles more fatigued and less able to squeeze the clothespin compared to resting before squeezing.