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: Some parasites kill their host, but most do not. 
Fact 2: Tapeworms are internal parasites of vertebrates.

A: most tapeworms do not kill their host.
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Q: Fact 1: Reproduction is the process by which organisms give rise to offspring. 
Fact 2: Sex equals reproduction.

A: sex is the process by which organisms give rise to offspring.
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Q: Fact 1: Aging is associated with the death of cells. 
Fact 2: Smoking accelerates the aging process.

A:
smoking accelerates the death of cells.
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