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: telephones are used for communication by two people by transmitting sound. 
Fact 2: All sounds are waves produced by the vibrations of material objects.

Output: Telephones are used for communication by two people by transmitting waves produced by the vibrations of material objects.


Input: Consider Input: Fact 1: Plasma cells are activated B cells that secrete antibodies. 
Fact 2: Antibodies are produced by plasma cells.

Output: activated B cells secrete antibodies.


Input: Consider Input: Fact 1: weathering means breaking down rocks from larger whole into smaller pieces by weather. 
Fact 2: Many weather events involve rain.


Output: rain can break down rocks into smaller pieces.