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: Most fungi get organic compounds from dead organisms. 
Fact 2: Many fungi decompose dead organic matter such as leaves, wood, feces, etc.
answer:
Fungi eat dead matter such as leaves.


question:
Fact 1: a speedometer is used for giving a driver feedback on the speed of their vehicle. 
Fact 2: Speed is the magnitude of velocity.
answer:
A speedometer is used for giving feedback on the velocity of a vehicle.


question:
Fact 1: sound can be used for communication by animals. 
Fact 2: Many insects communicate with sounds.
answer:

insects use sound to talk.