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: Most invertebrates have a more complex nervous system. 
Fact 2: Cephalopods have the most advanced nervous systems of all invertebrates.
Example Output: Cephalopods have a complex nervous system.

Example Input: Fact 1: extreme heat and pressure change rock into metamorphic rock. 
Fact 2: Marble is a metamorphic rock.
Example Output: extreme heat and pressure change rock into marble.

Example Input: Fact 1: Antigens are molecules that the immune system recognizes as foreign to the body. 
Fact 2: Antibodies respond to antigens by latching on to, or binding with, the antigens.
Example Output:
Antibodies responds to molecules that the immune system recognizes as foreign to the body by latching on to them.