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: Blood pressure is highest in arteries and lowest in veins. 
Fact 2: Apocymarin raises blood pressure.

A: apocymarin affects veins and arteries.
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Q: Fact 1: Mollusks reproduce sexually. 
Fact 2: Some mollusks have a shell.

A: some animals with shells reproduce sexually.
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Q: Fact 1: the vomiting reflex is used to remove toxic material from the stomach before it is absorbed. 
Fact 2: Vomiting is a reflex controlled by a vomiting center in the brain.

A:
the throwing up center of the brain is used to remove toxic material from the stomach before it is absorbed.
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