Question

where did the oxygen molecules come form that combined with the iron to form rust? the bicycle the air around us the rain rewatch

Explanation:

Rust is formed when iron reacts with oxygen. The oxygen molecules that combine with iron to form rust are present in the air around us. The bicycle is made of iron (or an iron - containing material) and is the reactant that combines with oxygen. Rain can accelerate the rusting process by providing moisture (which helps in the electrochemical reaction of rusting), but the oxygen for rusting comes from the air.

Answer:

the air around us