Research Has Determined That There Is a Biological Explanation for Why

Multiple Choice

Research has determined that there is a biological explanation for why women live longer than men. Which of these is true?

A) Women have two X chromosomes whereas men have only one.
B) Women have a higher brain-to-body weight ratio.
C) Women have less testosterone.
D) None of these have enough scientific support to explain why women, on average and in industrialized countries, outlive men.