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 bryophytes are small. 
Fact 2: Bryophytes are very old land plants.
Example Output: Most very old land plants are small.

Example Input: Fact 1: a compass is used to navigate oceans. 
Fact 2: Ocean waves travel on the surface of the water.
Example Output: A compass is used to travel on the surface of the water.

Example Input: Fact 1: irradiating food can be used to kill existing microorganisms in the food. 
Fact 2: Food-Borne Illnesses are the sickness that results from eating foods that are contaminated with harmful bacteria and other microorganisms.
Example Output:
irradiating food can prevent some illnesses.