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.

Ex Input:
Fact 1: rocks interacting with wind over long periods of time causes weathering. 
Fact 2: Rocks weather at different rates.

Ex Output:
wind affects rocks.


Ex Input:
Fact 1: a flashlight requires a source of electricity to produce light. 
Fact 2: Flashlights and remote controlled cars get their energy from batteries.

Ex Output:
cars use electricity.


Ex Input:
Fact 1: Birds evolved from a group of bipedal dinosaurs called theropods. 
Fact 2: Bird's feathers have evolved from reptile scales.

Ex Output:

feathers have evolved from reptile scales of bipedal dinosaurs called theropods.