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: cutting down trees has a negative impact on an ecosystem. 
Fact 2: Ecosystems are living communities.

Output: Cutting down trees has a negative impact on living communities.


Input: Consider Input: Fact 1: being distracted while driving can cause people to crash their car. 
Fact 2: Some children drive their parents to distraction.

Output: Children can cause drivers to crash.


Input: Consider Input: Fact 1: Immunity results from immunization. 
Fact 2: Immunization with vaccine is effective.


Output: The ability of an organism to not be susceptible to a certain disease can result from vaccines.