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.

Input: Consider Input: Fact 1: a light bulb requires electrical energy to produce light. 
Fact 2: Light is a part of the electromagnetic spectrum.

Output: A bulb requires electrical energy to produce part of the electromagnetic spectrum.


Input: Consider Input: Fact 1: Specialization occurs when competing species evolve different adaptations. 
Fact 2: Most species are highly specialized for their environments and evolve as the environments change.

Output: Specialization occurs when competing creatures evolve as the environments change.


Input: Consider Input: Fact 1: Playing is just one of many ways that mammals and other animals learn how to behave. 
Fact 2: Whales are aquatic mammals.


Output: playing is a way that whales learn how to behave.