Fact 1: Brain cells die quickly if their oxygen supply is cut off. Fact 2: If the oxygen supply to the brain is cut off, a stroke can occur. Given the two facts above, what die quickly if a stroke occurs?
OPTIONS:
- a fish
- animals
- brain cells
- organs
- critical organs
- protons
- neutrons
- bones

Answer: brain cells

Fact 1: Populations of viruses do not grow through cell division because they are not cells. Fact 2: Where most viruses are DNA, HIV is an RNA virus. Given the two facts above, what does not grow through cell division?
OPTIONS:
- p53
- AIDS
- host
- DDT
- lung
- HIV
- corn
- HPV

Answer: HIV

Fact 1: Biofuel is used to produce electricity by burning. Fact 2: Energy is created when objects are burned. Given the two facts above, what is biofuel used to produce?
OPTIONS:
- disease
- chemicals
- waste
- bamboo
- engines
- sleep
- energy
- food

Answer:
energy