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: Viruses contain DNA but not much else. 
Fact 2: Viruses are germs that cause people to get sick.
Example Output: germs that cause people to get sick contain DNA but not much else.

Example Input: Fact 1: Neurons transmit nerve impulses to other cells. 
Fact 2: Neurons transmit nerve messages.
Example Output: neurons transmit impulses to cells.

Example Input: Fact 1: natural disasters can cause animals to leave an environment. 
Fact 2: Animal migration is mystery of nature.
Example Output:
natural disasters can cause migration.