Question: Fact 1: An aquatic animal requires great amounts of water to survive.  Fact 2: Fish are backboned aquatic animals.  Given the two facts above, what requires great amounts of water to survive?
Answer: fish

Question: Fact 1: Athermal insulator slows the transfer of heat.  Fact 2: Insulation helps to block conduction of heat.  Given the two facts above, what prevents conduction?
Answer: insulator

Question: Fact 1: Some viruses can cause cancer.  Fact 2: Eventually the cancer kills.  Given the two facts above, what can some viruses do?
Answer:
kill