Researchers already know that women live longer than men in all parts of the world. Scientists have largely linked the difference in life expectancy between the sexes to biological survival factors. Now, a new study of wild mammals has found great differences in length of life and aging in many species of mammals. The researchers found that, in humans, women live almost 8 percent longer than men. But among wild mammals, females in 60 percent of the studied species live, on average, 18.6 percent longer.

Define species
an array of flowers
a group of living organisms consisting of similar individuals capable of reproducing
a group of websites that make up the Internet
a wide group of human beings
How much longer is a womans lifespan compared with males?
25 percent longer
20 percent longer
10 percent longer
8 percent longer
Scientists have linked the difference in life expectancy between the sexes to biological survival factors.
biological survival factors
car accidents
eating preferences
height differences between the sexes