instruction:
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.
question:
Fact 1: if an object reflects light toward the eye then that object can be seen. 
Fact 2: Light is made up of particles called photons.
answer:
If an object reflects photons toward the eye then that object can be seen.


question:
Fact 1: skin is used for breathing air by frogs. 
Fact 2: Air contains oxygen.
answer:
skin is used for breathing oxygen by frogs.


question:
Fact 1: magnetism can cause objects to repel each other. 
Fact 2: Magnets attract and repel.
answer:

magnetism attracts objects to each other.