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.

Example Input: Fact 1: a plant requires water to grow. 
Fact 2: Clouds form by the condensation of water vapor.
Example Output: a plant requires Clouds to grow.

Example Input: Fact 1: a radio converts electrical energy into vibrations. 
Fact 2: Electrical energy refers to energy associated with the flow of electrons.
Example Output: a radio converts the flow of electrons into vibrations.

Example Input: Fact 1: Mutations are essential for evolution to occur. 
Fact 2: Mutations in somatic cells are called somatic mutations .
Example Output:
somatic cells perform evolution.