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.

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

Fact 1: recycling reduces the resources needed to make something. 
Fact 2: Recyclability and recycling of materials is essential.
It is essential to reduce resources needed to make things.

Fact 1: the vanes rotating in an electric fan causes air to move. 
Fact 2: Rotational motion occurs when an object spins.

Vanes in a fan spinning causes air to move.