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.

Ex Input:
Fact 1: a valley is formed by a river flowing. 
Fact 2: Rivers erode the rocks they flow over.

Ex Output:
Water erodes rocks as they flow over, creating a valley.


Ex Input:
Fact 1: using a gasoline engine requires burning gasoline. 
Fact 2: Gasoline and flammable liquid related burns, however, are a preventable problem.

Ex Output:
using an engine requires burning flammable liquid.


Ex Input:
Fact 1: sexual reproduction increases genetic diversity. 
Fact 2: The conclusion is that genetic diversity is desirable for the health and long-term survival of a population.

Ex Output:

Sexual reproduction increases the odds of long-term survival in a population.