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: HIV infects and destroys helper T cells. 
Fact 2: T-helper cells are lymphocytes.
Example Output: HIV infects and destroys lymphocytes.

Example Input: Fact 1: changes in the pH of soil can cause plants to die. 
Fact 2: Sulfur lowers pH in soil.
Example Output: Adding sulfer to soil can cause plants to die.

Example Input: Fact 1: friction causes the temperature of an object to increase. 
Fact 2: When a fire breaks out in a home, the temperature in the room increases.
Example Output:
Friction causes fires to break out in a home due to temperature.