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

When can a theory be modified if a new type of technology allows for new observations that raise new questions? a-immediately, while the questions about the theory are being asked b-after new hypotheses related to the theory are tested in experiments c-only after the new observations disprove all parts of the theory d-while scientists begin to think about how the theory could improve