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: hearing is used for sensing sound by animals. 
Fact 2: All cats are animals.
Example Output: hearing is used for sensing sound by cats.

Example Input: Fact 1: using a gasoline engine requires burning gasoline. 
Fact 2: Oil and gasoline are fossil fuels.
Example Output: Many engines burn fossil fuels.

Example Input: Fact 1: a mold spore has a negative impact on the respiratory system. 
Fact 2: Blue Mold Blue mold is caused by a fungus spread by wind-borne spores.
Example Output:
Fungus spread by wind has a negative impact on the respiratory system.