Me plz i don't understand my science hw

As a pendulum bob swings back and forth several times, the maximum height it reaches becomes less and less. this is because more and more of the pendulum bob's energy is being transformed into a. heat energy b. kinetic energy c. potential energy d. kinetic energy and potential energy

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up

Which component of the earth’s atmosphere is decreased due to photosynthesis?