Steph is carrying a cup of water. He doesn’t see a wrinkle in the floor rug and he trips. Steph manages not to fall or drop the cup, but the water spills over the side of the cup and onto the floor What is the unbalanced force

What keeps moving

It is false that during exercise, the oxygen concentration in the blood increases to twice that of resting levels. As a matter of fact, the oxygen either stays the same or decreases, or it may increase slightly than it used to be when the person was resting, but it definitely does not double while exercising. Hope this helps. Let me know if you need additional help!