TASK DEFINITION: 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.
PROBLEM: 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.

SOLUTION: earthworms help plants grow.

PROBLEM: Fact 1: irradiating food can be used to kill existing microorganisms in the food. 
Fact 2: Food irradiation is blazingly high-tech.

SOLUTION: a blazingly high-tech method can be used to kill existing microorganisms in the food.

PROBLEM: Fact 1: infection can cause bodily tissues to swell. 
Fact 2: Connective tissue is the common network for bodily systems and energy pathways.

SOLUTION:
infection can cause connective tissues to swell.