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: 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: weathering means breaking down rocks from larger whole into smaller pieces by weather. 
Fact 2: Massive boulders and tiny rocks influence the sound and path of water.
Example Output: weathering means breaking down boulders by weather.

Example Input: Fact 1: Viruses are not cells at all, so they are neither prokaryotes nor eukaryotes. 
Fact 2: Viruses violate the cell theory.
Example Output:
a virus is not a eukaryote.