The graph shows altitude and atmospheric pressure. Altitude (feet) Air Pressure (pounds per square inch) sea level 14.7 10,000 10.2 20,000 6.4 30,000 4.3 40,000 2.7 50,000 1.6 In which layer of the atmosphere is air pressure the lowest? (1 point) Responses the troposphere the troposphere the mesosphere the mesosphere the stratosphere the stratosphere the thermosphere