Guess one it does not matter which one you choose a b c d

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.

If a solution had a ph of 7 what is the solution

Which of the following units is not an official si unit? mole liter kilogram ampere