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: Scientists who find and study fossils are called paleontologists. 
Fact 2: Fossil fuels are the fossilized remains of prehistoric animals and plants.
Example Output: paleontologists study the remains of plants.

Example Input: Fact 1: Heterotrophs are living things that cannot make their own food. 
Fact 2: All animals are heterotrophic and obtain their food from plants.
Example Output:
Animals obtain their food from plants and cannot make their own food.