(Please don’t post a link and actually give an answer) Why does mixing reactants in different molar ratio’s affect the amount of product and the amount of each reactant left over?

What does the process of natural selection involve

In which of these cases are the two wave points considered to be in phase with each other?

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.