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 scale is used for measuring weight. 
Fact 2: All weights are in grams.
Example Output: a scale is used for measuring grams.

Example Input: Fact 1: an animal requires energy to move. 
Fact 2: All dogs are animals .
Example Output: All dogs require energy to move.

Example Input: Fact 1: hibernation is used for conserving energy by some animals. 
Fact 2: Hibernation is a sleep-like state.
Example Output:
a sleep-like state is used for conserving energy by some animals.