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: 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: conserving resources has a positive impact on the environment. 
Fact 2: Environments reflect native habitats.

SOLUTION: conserving resources has a positive impact on native habitats.

PROBLEM: Fact 1: chemical weathering causes iron in rock to oxidize. 
Fact 2: Iron oxide gives a rusty red color to sedimentary rocks.

SOLUTION:
Chemical weathering gives a rusty red color to sedimentary rocks.