- Air goes into the lungs - The lungs remove oxygen from the air - Oxygen diffuses from alveoli in the lungs to the bloodstream - Hemoglobin in red blood cells attaches to the oxygen - Red blood cells carry oxygen all around the body What might be the last step of the process?
Ans: Oxygen diffuses into cells from capillaries.

- The gravity of the sun pulls its mass inward - There is a lot of pressure on the Sun - The pressure forces atoms of hydrogen to fuse together in nuclear reactions - The energy from the reactions gives off different kinds of light What might be the last step of the process?
Ans: The light travels to the Earth.

- Magma cools inside the crust - Magma crystalizes - Lava cools on the surface - Lava crystalizes What might be the last step of the process?
Ans: Minerals dissolved in water crystlize.

- Suns heat enters atmosphere - Green house gases enter from the earth - Heat is trapped in atmosphere - Different things on earth are hotter What might be the last step of the process?
Ans: The overall planet is hotter.