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.

Input: Consider Input: Fact 1: Scientists who find and study fossils are called paleontologists. 
Fact 2: Interest in fossils is worldwide.

Output: paleontologists study something with worldwide interest.


Input: Consider Input: Fact 1: landfills have a negative impact on the environment. 
Fact 2: An ecosystem is an environment and all the members of that environment.

Output: Landfills have a negative impact on the ecosystems.


Input: Consider Input: Fact 1: astronauts require preserved food for extended flights. 
Fact 2: Freeze-drying Freeze drying is a method of preserving materials.


Output: Freeze drying food keeps it viable for extended flights.