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 planet rotating causes cycles of day and night on that planet. 
Fact 2: Rotation determines day and night, and the length of the day.
Example Output: a planet's rotation is what causes night.

Example Input: Fact 1: Most fungi get organic compounds from dead organisms. 
Fact 2: Many fungi decompose dead organic matter such as leaves, wood, feces, etc.
Example Output: Fungi eat dead matter such as leaves.

Example Input: Fact 1: Complex chemistry is needed to carry out all the functions of life. 
Fact 2: Chemistry is primarily concerned with matter, energy, and their interactions.
Example Output:
the functions of life require energy.