Study island: reproduction, genetics & heredity: which of the following statements about genes and traits is true? a. a single gene can control a single trait. b. a single gene can influence multiple traits. c.a single trait can be controlled by multiple genes. it's all the above!

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?