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: Sperm pass out of the body through the urethra. 
Fact 2: Urine leaves the bladder in a single tube, the urethra, that runs to the penis or to the vagina.
Example Output: Sperm pass out of the body through a single tube that runs to the penis.

Example Input: Fact 1: Antigens are molecules that the immune system recognizes as foreign to the body. 
Fact 2: An antibody binds to an antigen .
Example Output: antibodies binds to molecules.

Example Input: Fact 1: volcanic ash in the atmosphere decreases the temperature by blocking the sun. 
Fact 2: Volcanic ash spewed into the atmosphere can block part of the sun's radiation, cooling the air.
Example Output:
Volcanic ash blocks the sun and cools the air.