What keeps an electron in motion around the nucleus to which it is attracted?

In all living cells dna controls cellular activities by

Which sentence about particles in matter is true? a. atoms are present in solids and liquids but not in gases. b. the particles of matter are in constant motion. c. the same kinds of atoms are found in different elements. d. when a solid changes to a liquid, the sizes of the particles change.

Compare and contrast refraction of light and sound will give brainliest