Fact 1: Skin is used for protecting the body from harmful substances. Fact 2: Pollution is the release of harmful substances into the environment. Given the two facts above, what does the skin protect against?

OPTIONS:
- smallpox
- A virus
- disease
- sun's heat
- cancer
- leukemia
- Pollution
- heat energy

Answer: Pollution

Fact 1: Oxygen is essential for cellular respiration for all aerobic organisms. Fact 2: Fungi are aerobic organisms. Given the two facts above, what requires oxygen for cellular respiration?

OPTIONS:
- bamboo
- gravity
- digestion
- plants
- fungi
- bacteria
- animals
- ferns

Answer: fungi

Fact 1: Alaser is used for producing light. Fact 2: Lights illuminate the blackness. Given the two facts above, what can lasers be used for?

OPTIONS:
- tag
- energy
- electricity
- illumination
- focusing a lens
- space
- Destroy bridges
- air

Answer: illumination

Fact 1: Sinkholes are formed by precipitation. Fact 2: Eventually, the sinkhole collapses into cavern. Given the two facts above, precipitation filling an underground void can create what?

OPTIONS:
- clouds
- soils
- cavern
- electricity
- mountain
- rain
- rivers
- flooding

Answer:
cavern