Fact 1: Adrought can change the color of an environment from green to brown. Fact 2: Too little rain causes a drought. Given the two facts above, what can change the color of an environment from green to brown?

OPTIONS:
- harmful substances
- clouds
- Greenhouse gasses
- blizzards
- deforestation
- Greenhouse gases
- blue skies
- too little rain

Answer: too little rain

Fact 1: Sharpening an object causes that object to change shape. Fact 2: An object is an item in the real world. Given the two facts above, what does sharpening an item do?

OPTIONS:
- changes shape
- alters smell
- changes color
- Relieve pain
- focusing a lens
- maintains shape
- duplicate itself
- lowered energy cost

Answer: changes shape

Fact 1: Thick fur can be used for keeping warm. Fact 2: All bears are covered with heavy fur. Given the two facts above, what keeps warm?

OPTIONS:
- bushes
- muscles
- Limbs
- fibers
- keratin
- skin
- bears
- hair

Answer: bears

Fact 1: Lung cancer is most often caused by exposure to tobacco smoke. Fact 2: Tobacco is most commonly smoked in cigarettes. Given the two facts above, what is lung cancer most often caused by exposure to?

OPTIONS:
- Chemical energy
- carbon dioxide
- asbestos
- sunlight
- water
- fossil fuels
- cigarettes
- hydrocarbons

Answer:
cigarettes