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: Pollination is the fertilization step in the sexual reproduction of plants. 
Fact 2: Pollination is mostly by honeybees, and wind pollination is limited.
Example Output: Honeybees are important for plant reproduction.

Example Input: Fact 1: plant reproduction requires pollination. 
Fact 2: Bees are necessary for pollination.
Example Output: plant reproduction requires bees.

Example Input: Fact 1: Insects may live in large colonies and have complex social behaviors. 
Fact 2: All termites are social insects.
Example Output:
termites are social.