Free is free get it aaa

Automobile fuel efficiency is often measured in miles that the car can be driven per gallon of fuel (mpg). heavier cars tend to have lower fuel efficiencies (lower mpg ratings). which variable (weight or fuel efficiency) is most naturally considered the explanatory (predictor) variable in this context?

If an electric circuit is not grounded it is best to reach out and touch it to provide the ground a.true or b.false

What structural formula represents 4 electrons shared between two atoms?