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: Evolution occurs by a process called natural selection. 
Fact 2: Adaptation and natural selection are discussed.
Example Output: Evolution occurs by a process of adaptation.

Example Input: Fact 1: a laser is used for producing light. 
Fact 2: Lasers, for instance, produce coherent light.
Example Output: Lasers are used to produce a beam that is coherent.

Example Input: Fact 1: Prokaryotes are single-celled organisms that lack a nucleus. 
Fact 2: Prokaryotes All bacteria are prokaryotes.
Example Output:
bacteria are single-celled organisms that lack a nucleus.