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: Mating is generally preceded by courtship. 
Fact 2: Courtship patterns vary with species.
Example Output: mating patterns vary with species.

Example Input: Fact 1: Earthworms are important deposit feeders that help form and enrich soil. 
Fact 2: For instance, in the forest, plants use sunlight and soil nutrients to grow.
Example Output: earthworms help plants grow.

Example Input: Fact 1: plant reproduction requires pollination. 
Fact 2: Many plants rely on bats to spread their seeds and to pollinate flowers.
Example Output:
plant reproduction requires bats to spread their seeds.