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: plant reproduction often requires pollen. 
Fact 2: Honeybees and other bees transfer the pollen.

SOLUTION: Plant reproduction often requires honeybees.

PROBLEM: Fact 1: Viruses contain DNA but not much else. 
Fact 2: Viruses are germs that cause people to get sick.

SOLUTION: germs that cause people to get sick contain DNA but not much else.

PROBLEM: Fact 1: Flowing water can slowly dissolve carbon in sedimentary rock. 
Fact 2: Rivers and streams are bodies of fresh, flowing water.

SOLUTION:
Rivers and streams can slowly dissolve carbon in sedimentary rock.