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.

Fact 1: DNA contains genetic instructions for proteins, and RNA helps assemble the proteins. 
Fact 2: DNA is the genetic material responsible for heredity.
The genetic material responsible for heredity contains instructions for proteins.

Fact 1: cooking food requires adding heat energy. 
Fact 2: Cooked foods are easier to digest.
Heat energy makes digestion easier.

Fact 1: when a river floods , that river deposits soil in flood plains. 
Fact 2: Minerals are the constituents of rocks, sediments, and soils.

when a river floods , that river deposits minerals in flood plains.