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: condensing means changing from a gas into a liquid by reducing heat energy. 
Fact 2: Heat is the energy of moving molecules.

SOLUTION: condensing means changing from a gas into a liquid by reducing moving molecules.

PROBLEM: Fact 1: measuring the hardness of minerals requires scratching those materials. 
Fact 2: Most gem stones are hard minerals.

SOLUTION: You can measure the hardness of a gem stone by scratching it.

PROBLEM: Fact 1: information in an organism 's chromosomes cause genetic traits to be passed down to that organism 's offspring. 
Fact 2: DNA, which contains our genetic code, is the basic building block of chromosomes.

SOLUTION:
DNA causes offspring to inherit genetic traits.