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: Hermit crabs use the shells of dead snails for homes. 
Fact 2: Hermit crabs find shells.

A: hermit crabs find dead snails to use as homes.
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Q: Fact 1: electricity sometimes is used for heating buildings. 
Fact 2: Nuclear fission is the only method currently used by nuclear plants to generate electricity.

A: Nuclear fission can be used to heat buildings.
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Q: Fact 1: running requires a lot of energy. 
Fact 2: Energy is the fuel for chemical reactions which run the various systems of the body.

A:
running requires fuel for chemical reactions which run the various systems of the body.
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