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.

Input: Consider Input: Fact 1: Mating is generally preceded by courtship. 
Fact 2: Courtship patterns vary with species.

Output: mating patterns vary with species.


Input: Consider Input: Fact 1: absorbing sunlight causes objects to heat. 
Fact 2: Heat can harm the camera and the film.

Output: Sunlight can harm a camera and film.


Input: Consider Input: Fact 1: Thyroid hormones increase the rate of metabolism in cells throughout the body. 
Fact 2: Graves disease is a thyroid gland that overproduces thyroid hormone.


Output: Graves disease increases the rate of metabolism in cells.