Fact 1: Afire requires oxygen to burn. Fact 2: They produce oxygen as a by-product of photosynthesis. Given the two facts above, a fire requires a by-product of what?
OPTIONS:
- sunlight
- heat energy
- electromagnetic energy
- photosynthesis.
- evaporation
- heating liquids
- Electrical energy
- harmful substances

Answer: photosynthesis.

Fact 1: If something is outside during the day then that something will receive sunlight. Fact 2: Energy flows from the sun in the form of sunlight. Given the two facts above, if something is outside during the day then that something will receive what?
OPTIONS:
- rays or beams
- energy from Mars
- ice
- water
- energy from the sun
- wavelengths and photons
- sun's heat
- rain or sun shine

Answer: energy from the sun

Fact 1: Drought is when amount of precipitation decreases. Fact 2: Drought or rain also affect the harvest and the planning. Given the two facts above, what affects the harvest?
OPTIONS:
- climate
- thunder
- competition
- precipitation
- Pollution
- lightning
- Time and energy
- earthquakes

Answer:
precipitation