Problem:OPTIONS:
- Light
- Energy.
- fire
- waves
- heat
- energy
- gas
- LEDs

Fact 1: Afirecracker converts chemical energy into sound. Fact 2: Particularly interesting waves are sound waves . Given the two facts above, what does a firecracker convert chemical energy into?
****
A: waves

Problem:OPTIONS:
- Most plants
- Plants growth
- rocks
- movement
- trees
- Heart rate
- moon
- athletes

Fact 1: Hormones are chemical messengers that control many body functions. Fact 2: And like other downers, it slows bodily functions, including breathing and heart rate. Given the two facts above, what do hormones control?
****
A: Heart rate

Problem:OPTIONS:
- at room temperature
- Plant growth is reduced
- cloudy and rainy weather
- pillows
- heat or cold
- sleeping
- Riding a bike
- when cell walls relax

Fact 1: Dilation occurs when cell walls relax. Fact 2: Dilation is often uncomfortable. Given the two facts above, when is it often uncomfortable?
****
A: when cell walls relax

Problem:OPTIONS:
- Cooking
- walking
- high fat
- Heart rate
- skipping meals
- pollution
- sweating
- food

Fact 1: Exercise has a positive impact on a human 's health. Fact 2: For exercise, moderate exercise such as walking is recommended. Given the two facts above, what is a moderate way to have a positive impact on a human 's health?
****
A:
walking