06:00-08:00 h 08:00-10:00 h Direct sunlight Indirect sunlight Fresh prairie dog scat No fresh prairie dog scat Deep tunnel Above ground B Below ground Shallow tunnel Soil plug Deep tunnel Prairie dog nest Prairie dogs are able to breathe inside their tunnels because different wind speeds above the tunnel create a pressure differential that forces air through the tunnel. In this case, the wind speed is 8.5 m/s at point A and 1.3 m/s at point B. Assuming that the elevation and air density (1.29 kg/m') is the same at these two points, what is the pressure difference caused by the wind speeds? P= unit Knowing that air flows from high to low pressure, which direction will the air move through these tunnels? O From A to B From B to A O Cannot be determined