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: Chloroplasts contain the green pigment chlorophyll. 
Fact 2: Mitochondrion and chloroplast for example are organelles.
Example Output: organelles contain chlorophyll.

Example Input: Fact 1: when light enters the eye through the pupil , that light falls on the retina. 
Fact 2: Images are retained on the retina of a viewer's eye for a fraction of a second after they strike it.
Example Output: Light causes images to be retained on the retina.

Example Input: Fact 1: Brain cells die quickly if their oxygen supply is cut off. 
Fact 2: Air contains oxygen.
Example Output:
Brain cells die quickly if their air supply is cut off.