input with options: Fact 1: Air pollution can cause the pH of soil to decrease. Fact 2: Compost balances the pH of soil. Given the two facts above, what balances the effect of air pollution in soil?
OPTIONS:
- wind
- rubber
- batteries
- watershed
- salinity
- Earthworms
- compost
- acid
output: compost

input with options: Fact 1: Aflashlight requires a source of electricity to produce light. Fact 2: Battery can be tested with flashlight. Given the two facts above, a battery is a source of what that is able to produce light?
OPTIONS:
- energy
- wire
- radiation
- heat energy
- sunlight
- oil
- electricity
- Solar energy
output: electricity

input with options: Fact 1: Mutations are essential for evolution to occur. Fact 2: Natural selection is the mechanism of evolution. Given the two facts above, what enables natural selection to occur?
OPTIONS:
- environment
- mutations
- competition
- relocation
- Darwin
- evolutionary development
- root growth
- research
output: mutations

input with options: Fact 1: Seasons cause change to the environment. Fact 2: Summer is a hot, wet season. Given the two facts above, what can cause change to the environment?
OPTIONS:
- Winter
- flooding
- vacuums
- drought
- summer
- pennies
- digestion
- pesticide
output:
summer