Fact 1: Exercise has a positive impact on a human 's health.

Fact 2: Prevention is key to their health, longevity, and reproduction.

Given the two facts above, answer the question "Human longevity and reproduction are positively impacted by:" with the following options: 
- aging
 - food
 - nutrients
 - gene flow
 - old age
 - exercise
 - dying young
 - reduced heat


 

      exercise   