Which of the following describes an action-reaction pair? A. Your feet push down on the ground, and the ground pushes up on
your feet.
B. Your backpack pulls down on your shoulders, and your feet push
on the ground.
C. You push on a wall, and your feet push on the ground.
D. The Sun's gravity pulls on you, and Earth's gravity pulls on you.

Which best describes the first law of thermodynamics as compared to the second law of thermodynamics? a. the first law describes how thermal energy is conserved but not the direction it moves. b. the first law describes the direction thermal energy moves but not how it is conserved. c. the first law describes how thermal energy can be created but not how it can be destroyed. d. the first law describes how thermal energy can be destroyed but not how it can be created.