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.

Q: Fact 1: Air pollution harms the respiratory and circulatory systems. 
Fact 2: An example of an air pollution reaction is the production of photochemical smog.

A: Smog harms the respiratory and circulatory systems.
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Q: Fact 1: Fungi are the only organisms that can decompose wood. 
Fact 2: Beech woods are without doubt a very rich habitat for fungi.

A: Fungi are the only organisms that can decompose beech.
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Q: Fact 1: crumple means change shape from smooth into compacted by physical force. 
Fact 2: Density increases with depth due to compaction and progressive cementation.

A:
crumple means density increases by physical force.
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