Fact 1: Staying warm has a positive impact on an animal 's survival.

Fact 2: Man is an animal with primary instincts of survival.

Given the two facts above, answer the question "What has a positive impact on mans survival?" with the following options: 
- food
 - support
 - heat
 - warmth
 - bamboo
 - warm
 - glycogen
 - hormones


 

    warmth     