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.

[Q]: Fact 1: killing microorganisms in food can be used to extend the shelf life of that food. 
Fact 2: Irradiation kills microorganisms that spoil food.
[A]: Irradiating food can extend shelf life by removing microorganisms.


[Q]: Fact 1: Behaviors can be learned through play. 
Fact 2: Cognitive behavior is the behavior of understanding.
[A]: play is cognitive.


[Q]: Fact 1: being burried under soil and mud changes vegetation into peat through extreme heat and pressure in a swamp over a long period of time. 
Fact 2: Often, the soil consists of mats of very acidic, semi-decayed vegetation, such as peat.
[A]:
Decayed vegetation turns to peat in a swamp over periods of time.