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: Cells cannot survive without oxygen. 
Fact 2: Life is responsible for oxygen in the atmosphere.
Example Output: cells cannot survive without the atmosphere.

Example Input: Fact 1: rain causes erosion. 
Fact 2: Erosion is the breaking apart and moving of rocks and soil.
Example Output: Rain causes the breaking apart and moving of rocks and soil.

Example Input: Fact 1: an organism requires energy for growth. 
Fact 2: Growth is controlled by growth cones.
Example Output:
an organism requires energy for something controlled by cones.