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.

[Q]: Fact 1: Many consumers feed at more than one trophic level. 
Fact 2: Consumers include insects and animals.
[A]: Many insects and animals feed at more than one trophic level.


[Q]: 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.
[A]: cooking oil heats food.


[Q]: Fact 1: the type of material through which sound passes changes the speed at which sound travels. 
Fact 2: Hearing is the act of perceiving sound.
[A]:
the speed of hearing changes depending on the material passed through.