Q: - The oxygen travels to the lungs through the windpipe - The air sacs in the lungs send the oxygen into the blood stream - The carbon dioxide in the blood stream is transferred to the air sacs - The lungs expel through the nose or mouth back into the environment. What might be the first step of the process?
A: You breathe oxygen into your body through the nose or mouth

Q: - Is exposed to air - A chemical reaction occurs - The iron starts to oxidize - The iron starts to rust. What might be the first step of the process?
A: Iron is exposed to oxygen

Q: - The dishwasher heats the water - The detergent dispenser opens at the right time - Water is shot through the jets to clean the dishes - The dirty water is drained - More water is sprayed to rinse the dishes - The water is drained again - The air is heated in the dishwasher to dry the dishes. What might be the first step of the process?
A: Water flows into the dishwasher

Q: - The water combines with carbon dioxide in the air to form carbonic acid - As the acid is formed, the iron starts to dissolve - Some of the water breaks down into hydrogen and oxygen - The free oxygen and dissolved iron bond together - They form iron oxide, which is rust - What might be the first step of the process?
A:
Water comes into contact with something made of iron