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: hydropower requires damming a river. 
Fact 2: Hydropower is a renewable resource.

Output: Damming a river can provide a renewable resource.


Input: Consider Input: Fact 1: melting means changing from a solid into a liquid by adding heat energy. 
Fact 2: Heat energy from the sun is stored in the earth.

Output: Melting means changing from a solid into a liquid by adding heat from the sun.


Input: Consider Input: Fact 1: Birds move their wings using muscles in the chest. 
Fact 2: Class Aves is for the birds, literally.


Output: Animals in class aves move their wings using muscles in the chest.