9 Why did the auto industry make a change from generating cars that relied on diesel fuel to cars that ran on unleaded gasoline in the 1970s?
vehicles that used unleaded gasoline were less likely to break down
burning diesel fuel pollutes the air more than burning gasoline
unleaded gasoline was cheaper to manufacture than diesel
unleaded gasoline was easier to make than diesel fuel

B"hf and f-"  is the correct answer took the test on edgenuity and got it right     

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Idon't have a clue what this

According to the picture i find on internet ()  answers are: 1) arrow f represent cellular respiration where organic matter is transformed into carbon dioxide.2) chemical reaction: c₆h₁₂o₆ + 6o₂ → 6co₂ + 6h₂o.there is same number of atoms on both side of chemical reaction.3) because organic carbon (glucose) is transformed into inorganic carbon (carbon dioxide) that goes into atmosphere.