B.the mass of carbon dioxide plus water is less than that of paper plus oxygen.
Answer:
pressure gradient
Explanation:
The correct answer would be pressure gradient.
<em>A pressure gradient is created when there is a difference in the amount of pressure between two points or locations that are adjacent to one another.</em>
In this case, the two locations that are adjacent to one another are the inside and outside of the lung. When one breathes in, the pressure inside the lung is more than that of the outside and the lung expands as a result. When we breathe out, the pressure outside is more than that of the inside and the lung collapses.
Digestive system!!! plzz give me brainlyest
