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: Soil can be depleted of nutrients. 
Fact 2: For the nonrenewable resources, depletion means extraction of the available natural resources.
Example Output: soil nutrition can be extracted.

Example Input: Fact 1: Mutations that lead to cancer usually occur in genes that control the cell cycle. 
Fact 2: Mitosis is part of the cell cycle.
Example Output: Mutations that lead to cancer usually occur in genes aiding in mitosis.

Example Input: Fact 1: a wheeled vehicle requires smooth surfaces. 
Fact 2: Skateboard Trucks Trucks, or axles, are what hold the wheels on the board.
Example Output:
a skateboard requires smooth surfaces.