Final answer:
Oxygen levels in the atmosphere vary in different layers, with the highest concentration in the troposphere and decreasing as you move higher.
Step-by-step explanation:
The statement "Are oxygen levels the same in all layers of the atmosphere?" is false. Oxygen levels vary in different layers of the atmosphere. The highest concentration of oxygen is found in the troposphere, which is closest to the Earth's surface. As you move up into the stratosphere, mesosphere, thermosphere, and exosphere, the concentration of oxygen decreases. The composition of the atmosphere changes with each layer, and the levels of oxygen, nitrogen, and other gases vary accordingly.