- Bark is a protective covering around the trunk of / branches of a tree
- As the thickness of something increases , the resistance  of that something to damage will increase
- So, thick bark protects a tree from damage

- Fire causes burning
- Burning a living thing usually causes harm to that living thing
- Hence, fire causes harm to living things

- Thick bark protects a tree from damage
- Fire causes harm to living things
- So, thick bark protects a tree from damage caused by fire

- Thick bark protects a tree from damage caused by fire
- Protecting a living thing has a positive impact on that living thing 's survival
- Therefore, thick bark has a positive impact on a tree's survival in a fire

So, thick bark has a positive impact on a tree's survival in a fire
Some types of trees are able to survive the heat of a forest fire. Which of the following characteristics would best help a tree survive a fire?
- Fire causes burning 
- Bark is a protective covering around the trunk of / branches of a tree 
- Protecting a living thing has a positive impact on that living thing 's survival 
- As the thickness of something increases , the resistance  of that something to damage will increase 
- Burning a living thing usually causes harm to that living thing