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: Specialization occurs when competing species evolve different adaptations. 
Fact 2: Most species are highly specialized for their environments and evolve as the environments change.
Example Output: Specialization occurs when competing creatures evolve as the environments change.

Example Input: Fact 1: lungs are used for breathing air by land animals. 
Fact 2: African Elephants are the biggest land animals.
Example Output: african elephants have lungs.

Example Input: Fact 1: Nonmetal elements are far fewer in number. 
Fact 2: Each element is either a metal, nonmetal, or metalloid.
Example Output:
elements that are not metal or metalloid are far fewer in number.