Which one is it? It’s my final, please and thanks!!!

What produces wave a)sound b) heats c)transfer of energy d)vibrations

In a ball-and-stick molecular model, what do the sticks represent?

Which is true concerning the products and reactants of photosynthesis and cellular respiration? a. the products of photosynthesis are sugars and the reactants of cellular respiration are starches. b. the products of photosynthesis are reactants in cellular respiration. c. oxygen is needed for photosynthesis and is given off in cellular respiration.