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: a pan is used for cooking food by heating food in it on a stove. 
Fact 2: Heat pan, add cooking oil to pan.
answer:
cooking oil heats food.


question:
Fact 1: uneven heating of the Earth 's surface cause wind. 
Fact 2: WIND Wind is the movement of atmospheric air on a planet.
answer:
Uneven heating of the Earth 's surface causes the movement of atmospheric air.


question:
Fact 1: Some arthropods have special excretory structures. 
Fact 2: Insects are the largest group of arthropods.
answer:

Some insects have special excrectory structures.