How do electrons differ from protons and neutrons?
a. they do not move
b. they are larger
c. they are not in a fixed position
d. they are located in the nucleus

Consider the story you just read. all but one of the choices below indicate that something is living.

What is a substance? a. a physical property of matter b. a chemical property of matter c. an element or compound that cannot be physically separated d. characteristics used to tell the difference between mixtures

Name 3 types of energy you see being used as you look around a classroom