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: Transcription takes place in the nucleus. 
Fact 2: Transcription of DNA into mRNA occurs in the nucleus.

Output: DNA is transcribed in the nucleus.


Input: Consider Input: Fact 1: boulders are formed by glaciers melting sometimes. 
Fact 2: Glaciers are made of snow, ice and rock.

Output: boulders are formed by snow, ice, and rock melting sometimes.


Input: Consider Input: Fact 1: cold fronts cause thunderstorms as they pass by. 
Fact 2: If cold air is advancing on warm air, the front is called a cold front.


Output: Cold air advancing on warm air can cause a thunderstorm to occur.