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 cause many human diseases. 
Fact 2: Human viruses are created by natural process.

SOLUTION: Something created by a natural process  cause many human diseases.

PROBLEM: Fact 1: some light bulbs convert electricity into light and heat energy. 
Fact 2: Light Bulbs Incandescent bulbs are available at the front desks.

SOLUTION: Incandescents convert electricity into light and heat energy.

PROBLEM: Fact 1: Molecules of tRNA bring amino acids to the ribosome in the correct sequence. 
Fact 2: Proteins are manufactured at the ribosomes.

SOLUTION:
molecules of tRNA bringing amino acids in the correct sequence manufactures proteins.