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.

[EX Q]: Fact 1: measuring the hardness of minerals requires scratching those materials. 
Fact 2: Most gem stones are hard minerals.
[EX A]: You can measure the hardness of a gem stone by scratching it.

[EX Q]: Fact 1: Coral reefs provide food and shelter to many ocean organisms. 
Fact 2: Oceans are important to life on Earth.
[EX A]: coral reefs are important to earth.

[EX Q]: Fact 1: the mass of a planet causes the pull of gravity on that planet. 
Fact 2: Gravity is what causes things to have weight.
[EX A]:
the mass of a planet is what causes things to have weight.