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: Electron transport is the final stage of aerobic respiration. 
Fact 2: Electron transport is like a waterfall.
answer:
Transport like a waterfall is the final stage of aerobic respiration.


question:
Fact 1: Hair helps to insulate and protect the body. 
Fact 2: Hair is composed of the protein keratin.
answer:
The protein keratin helps to insulate and protect the body.


question:
Fact 1: Skin color is a polygenic trait. 
Fact 2: Polygenic traits are the result of the interaction of several genes.
answer:

skin color is the result of the interaction of several genes.