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: Humans have collected and grown mushrooms for food for thousands of years. 
Fact 2: Foods rich in chlorine are mushrooms, parsley, sweet potato, rhubarb, and especially tomato.
Example Output: Humans have collected and grown foods rich in chlorine for thousands of years.

Example Input: Fact 1: having food has a positive impact on an organism 's health. 
Fact 2: And anything edible is food.
Example Output: Having edible things has a positive impact on an organism 's health.

Example Input: Fact 1: a valley is formed by a river flowing. 
Fact 2: Most of the valley floors are old lake beds.
Example Output:
Lake beds were often formed by a flowing river.