C. When you take a step, the ground pushes back on your foot with the same amount of force. If it pushed back with less, your foot would go through the floor; if it pushed back with more, it would actually push your foot off the ground. But they're in opposite directions; your foot pushes down, while the ground pushes up.
Hope this helps!
Glucose is an organic molecule.
So the correct answer is B.
Hope this helps,
Davinia.
Barry's antibodies are ab while Anna's antibodies are b
