Combine the given two facts to write a concluding fact. Note that there should be some parts of the first and second facts that are not mentioned in this conclusion fact. Your combined fact should be the result of a chain between the two facts. Chains form when two facts connect together to produce a concluding fact. An example of a chain is: "pesticides cause pollution" (fact1) + "pollution can harm animals" (fact2) → "pesticides can harm animals" (conclusion fact). Parts of the concluding fact overlap with the first and the second fact. To construct such a  concluding fact, a useful way is to borrow the subject from one fact and the ending conclusions from another fact.

Example Input: Fact 1: a vehicle is used for transportation. 
Fact 2: Cars are vehicles and trucks are vehicles.
Example Output: A car is used for transportation.

Example Input: Fact 1: extreme heat and pressure change rock into metamorphic rock. 
Fact 2: Marble is a metamorphic rock.
Example Output: extreme heat and pressure change rock into marble.

Example Input: Fact 1: preventing the transfer of heat from an organims 's body causes that organism to keep warm. 
Fact 2: Leaves keep animals warm.
Example Output:
Leaves are used by animals to stop transfer of heat from their body.