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: hydropower requires damming a river. 
Fact 2: Hydropower is a renewable resource.
[A]: Damming a river can provide a renewable resource.


[Q]: Fact 1: Transcription takes place in the nucleus. 
Fact 2: Transcription of DNA into mRNA occurs in the nucleus.
[A]: DNA is transcribed in the nucleus.


[Q]: Fact 1: a light bulb is used for seeing in the dark. 
Fact 2: Evening had arrived quickly, and it was almost too dark for the old man to see where to step safely.
[A]:
a light bulb is used for seeing where to step safely.