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.

Ex Input:
Fact 1: skin is used for protecting the body from harmful substances. 
Fact 2: Contamination is the unintended presence of harmful substances or microorganisms in food.

Ex Output:
The skin is used for protecting the body from contamination.


Ex Input:
Fact 1: Pollination is the fertilization step in the sexual reproduction of plants. 
Fact 2: Pollination is mostly by honeybees, and wind pollination is limited.

Ex Output:
Honeybees are important for plant reproduction.


Ex Input:
Fact 1: an animal requires air for survival. 
Fact 2: It is breathed in by animals and restored to the air by the photosynthesis mechanism of plants.

Ex Output:

Animals rely on plants for survival.