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 valley is formed by a river flowing. 
Fact 2: Examples are Napa Valley and Sonoma Valley.
Example Output: Napa and Sonoma were formed by a river flowing.

Example Input: Fact 1: when a body of water receives more water than it can hold , a flood occurs. 
Fact 2: Floods are deadly, floods are devastating.
Example Output: When a body of water receives more water than it can hold, death and devastation can result.

Example Input: Fact 1: Evolution occurs in response to a change in the environment. 
Fact 2: Speciation is an extension of evolution.
Example Output:
speciation occurs in response to a change in the environment.