instruction:
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.
question:
Fact 1: Energy is passed up a food chain or web from lower to higher trophic levels. 
Fact 2: Plants represent the first trophic level.
answer:
Energy is passed up a food chain from plants.


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


question:
Fact 1: DNA contains genetic instructions for proteins, and RNA helps assemble the proteins. 
Fact 2: DNA and RNA RNA and DNA are polymers of nucleotides.
answer:

polymers of nucleotides help assemble the proteins.