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: Hair helps to insulate and protect the body. 
Fact 2: Hair is composed of the protein keratin.

Output: The protein keratin helps to insulate and protect the body.


Input: Consider Input: Fact 1: Cells have multiple repair mechanisms to fix mutations in DNA. 
Fact 2: And if the damaged DNA is duplicated, it causes mutation.

Output: Cells have multiple repair mechanisms to fix damaged DNA duplication.


Input: Consider Input: Fact 1: Earth 's tilt on its rotating axis causes seasons to change. 
Fact 2: Seasons are caused by the motion of the Earth around the Sun and the tilt of the Earth's axis.


Output: seasons change because of tilt.