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: An ecosystem can be in a desert, a tropical jungle, an ocean or a pond.

Output: cutting down trees has a negative impact on a jungle.


Input: Consider Input: Fact 1: the emission of sulfur dioxide causes acid rain. 
Fact 2: ACID RAIN Acid rain is polluted and harmful to the environment.

Output: Sulfur dioxide emissions cause pollution and harm to the environment.


Input: Consider Input: Fact 1: Echinoderms have a unique water vascular system with tube feet. 
Fact 2: Starfish and sea urchins are also echinoderms.


Output: sea urchins have a unique water vascular system with tube feet.