Problem:OPTIONS:
- magnet
- energy
- direct energy
- wind
- water
- energy usage
- electricity
- animal transport

Fact 1: Awindmill converts wind energy into electricity primarily by using mechanical energy. Fact 2: Windmills are machines operated by windpower. Given the two facts above, what does windpower get converted into?
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A: electricity

Problem:OPTIONS:
- pathogens
- electrons
- smallpox
- amoebae
- vitamins
- lungs
- viruses
- smoking

Fact 1: Disease-causing microbes have a negative impact on the body. Fact 2: Pathogens are microbes that cause disease. Given the two facts above, what has a negative impact on the body?
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A: pathogens

Problem:OPTIONS:
- prolactin release
- kaleidoscope
- electron microscope
- deoxyribonucleic acid
- radars
- deuterostomes
- Electrical energy
- stethoscope

Fact 1: An electron microscope is used for seeing very small objects by making them appear bigger. Fact 2: Each cell is too small to see with the naked eye. Given the two facts above, what can make cells appear bigger?
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A: electron microscope

Problem:OPTIONS:
- The atmosphere
- kinetic energy
- smoke
- crop yields
- nutrients
- Temperature
- fires
- smog

Fact 1: Air pollution can cause the pH of soil to decrease. Fact 2: Research has shown that soil pH less than 6.0 can decrease crop yields. Given the two facts above, air pollution can cause a decrease in what?
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A:
crop yields