Classify each as either a homogeneous or heterogeneous substance?

I don‘t know how to tell the difference.Iron oreQuartzGraniteEnergy drinkOil-and-vinegar salad dressingSaltNitrogen

I can't believe you would put this question on here without including the make/year/model of the vehicle you're asking about. What do you expect us to tell you?

Homo- Made of same molecules Iron ore, Salt, Nitrogen Hetero - Made of different molecules Quartz, Granite, Energy Drink, Oil and Vinegar Salad Dressing!