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: Ribosomes are sites where proteins are made. 
Fact 2: Ribosomes attach to the rough ER .
Example Output: sites where proteins are made attach to the rough ER.

Example Input: Fact 1: if all members of a species cannot produce offspring then that species will likely become extinct. 
Fact 2: Some species become so specialized in their breeding requirements that extinction looms near.
Example Output: specialized breeding can accelerate extinction.

Example Input: Fact 1: clouds are formed by water vapor rising into colder regions of the atmosphere and condensing. 
Fact 2: Water is made up of H2O molecules.
Example Output:
clouds are formed by h2o vapor rising into colder regions of the atmosphere and condensing.