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: lakes are formed by precipitation and runoff. 
Fact 2: The Caspian Sea is, strictly speaking, not really a sea but instead the world's largest lake.
Example Output: The Caspian Sea was formed by precipitation and runoff.

Example Input: Fact 1: a speedometer is used for giving a driver feedback on the speed of their vehicle. 
Fact 2: Speed is the magnitude of velocity.
Example Output: A speedometer is used for giving feedback on the velocity of a vehicle.

Example Input: Fact 1: Vertebrates are all chordates that have a backbone. 
Fact 2: Fish are the first known true chordates.
Example Output:
Fish are the first known animal with a backbone.