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.

Input: Consider Input: Fact 1: being burried under soil and mud changes peat into coal through extreme heat and pressure in a swamp over a long period of time. 
Fact 2: Most coal is fossil peat.

Output: fossils turn into coal over time.


Input: Consider Input: Fact 1: Mammals generate heat mainly by keeping their metabolic rate high. 
Fact 2: Shrews have the highest metabolism of any mammal.

Output: Shrews generate the most heat by keeping their metabolic rate high.


Input: Consider Input: Fact 1: treating water is used to remove harmful substances before drinking. 
Fact 2: Boiling is the most reliable way to treat contaminated water.


Output: Boiling can make water less harmful to drink.