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: gravity pulls objects towards planets. 
Fact 2: Earth is our planet.
Example Output: gravity pulls objects towards earth.

Example Input: Fact 1: weathering means breaking down rocks from larger whole into smaller pieces by weather. 
Fact 2: Massive boulders and tiny rocks influence the sound and path of water.
Example Output: weathering means breaking down boulders by weather.

Example Input: Fact 1: a mold spore has a negative impact on the respiratory system. 
Fact 2: Mildew and mold spores are everywhere.
Example Output:
mildew can affect the respiratory system.