Problem:OPTIONS:
- trout
- bamboo
- microwave
- grill
- Green beans
- fur and fat
- stove
- fire

Fact 1: Apan is used for cooking food by heating food in it on a stove. Fact 2: Also, microwave ovens produce much less heat than stoves for cooking. Given the two facts above, what produces less heat when cooking?
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A: microwave

Problem:OPTIONS:
- spiders
- rocks
- seeds
- water
- pollen
- plankton
- barnacles
- food

Fact 1: Bivalves feed on plankton and nonliving organic matter. Fact 2: Bivalved arthropods are especially common. Given the two facts above, what do arthropods feed on?
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A: plankton

Problem:OPTIONS:
- sound
- Movement of an air mass
- burning coal
- static electricity
- In the winter
- potential energy
- by indirect light
- geothermal energy

Fact 1: Energy is used for heating a building by a heating system. Fact 2: Geothermal energy is used for heating and cooling systems. Given the two facts above, what is a way to heat a building?
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A: geothermal energy

Problem:OPTIONS:
- clean air
- fresh scent
- Toxicity
- Pollution
- negative
- lung cancer
- healthy lungs
- Dehydration

Fact 1: Lung cancer is most often caused by exposure to tobacco smoke. Fact 2: Secondhand smoke is also known as Environmental Tobacco Smoke. Given the two facts above, what can be caused by secondhand smoke?
****
A:
lung cancer