Problem:OPTIONS:
- carbon dioxide
- electricity
- organic molecules
- thrust
- hydrocarbons
- a hydraulic system
- kinetic energy
- fossil fuels

Fact 1: Acar engine usually converts gasoline into motion and heat through combustion. Fact 2: Gasoline is made up of hydrocarbons. Given the two facts above, a car engine uses what to aid in combustion?
****
A: hydrocarbons

Problem:OPTIONS:
- ambitious
- Damages them
- aggression
- complex
- loving
- insects
- smoking
- curious

Fact 1: Aggression is behavior that is intended to cause harm or pain. Fact 2: Most definitions of aggression include behaviors that are intended to hurt or harm others. Given the two facts above, what behavior causes people to hurt others?
****
A: aggression

Problem:OPTIONS:
- reducing conducting
- heat
- boiling
- wiring
- not conducting
- removing conducting
- engines
- energy

Fact 1: Wiring requires an electrical conductor. Fact 2: Copper is a good conductor of electricity. Given the two facts above, what can copper be used in?
****
A: wiring

Problem:OPTIONS:
- voltage
- visible energy
- fingers
- refraction of light
- gravity shifts
- amount of heat
- the skin
- change in density

Fact 1: Some touch receptors sense differences in temperature or pain. Fact 2: Temperature Temperature is an measurement of the amount of heat. Given the two facts above, what do some touch receptors sense differences in?
****
A:
amount of heat