Activity 3: Multiple Choice. Choose the letter of the correct answer. 1. How is chemical energy stored in food used by the human body? It is used a. for growth b. for fattening c. for growth and development d. for increasing body weight only 2. Why can human body perform various activities? a. because of its fixed parts b. because of energy it gets in food c. because of the water it contains d. because of oxygen in the bloodstream 3. Why is electricity commonly used as a source of energy in urban areas? a. because it is fashionable b. because it is convenient c. because there is pollution d. because there is abundance of sunlight 4. Which of the mechanical energy drives the nail into a piece of wood? a. hammer b. flashlight c. screw d. ruler 5. In what way can wind generate electricity? a. through the windmill b. through the use of electric fan c. through the use of generator c. through the hydroelectric power plant​