Which of these factors makes nuclear energy unsustainable? a. nuclear power plants last the longest. b. nuclear energy requires wind turbines. c. nuclear power plants cost the most to build. d. nuclear energy relies on uranium.

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.