Fact 1: Lung cancer is most often caused by exposure to tobacco smoke. Fact 2: Lung cancer is the deadliest of all cancers. Given the two facts above, what is very deadly?

OPTIONS:
- sticks
- truth
- insults
- Pesticides
- chlorofluorocarbons
- Tobacco smoke
- Electrical energy
- forest is destroyed

Answer: Tobacco smoke

Fact 1: Matter vibrating can cause sound. Fact 2: Words are only gross sounds heard through the ear. Given the two facts above, what can be heard through the ear?

OPTIONS:
- matter vibrating
- encoded information
- mean thoughts
- absence of noise
- ear drums
- in the frog family
- electromagnetic energy
- the body's largest organ

Answer: matter vibrating

Fact 1: Sex hormones are chemical messengers that control sexual development and reproduction. Fact 2: Androgens are male sex hormones. Given the two facts above, what are chemical messengers?

OPTIONS:
- Acids
- photons
- androgens
- basic
- metal
- Life forms
- nerves
- glucose

Answer: androgens

Fact 1: Afire requires oxygen to burn. Fact 2: Building destroyed by fire. Given the two facts above, what is required to burn a building?

OPTIONS:
- oxygen
- voltage
- sigh
- ghost
- words
- sunlight
- heat
- power

Answer:
oxygen