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: Mating is generally preceded by courtship. 
Fact 2: For example, a black rooster and a white hen mate, and the resulting offspring are gray.
Example Output: courtship can result in offspring.

Example Input: Fact 1: Viruses cannot reproduce by themselves. 
Fact 2: Viruses include the Tobacco Mosaic Virus.
Example Output: The Tobacco Mosaic Virus cannot reproduce by itself.

Example Input: Fact 1: Plants that are adapted to very dry environments are called xerophytes. 
Fact 2: Plants that have adapted by altering their physical structure are called xerophytes .
Example Output:
Xerophytes change their physical structure to adapt to dry environments.