Q: Fact 1: Heat and pressure change the remains of prehistoric living things into natural gas. Fact 2: Fossils are the remains of prehistoric life. Given the two facts above, what two things turn fossils to natural gas? | OPTIONS:
- heat and cold
- heat and fuel
- hydrogen and oxygen
- heat and pressure
- pressure and time
- scarce resources
- kinetic energy
- chemical changes
A: heat and pressure

Q: Fact 1: Drought is when amount of precipitation decreases. Fact 2: Drought decreases the availability and abundance of the natural food supply. Given the two facts above, what decreases when precipitation does? | OPTIONS:
- Pests
- Winter
- Food
- loss
- pH
- Soda
- elms
- Sunlight
A: Food

Q: Fact 1: Mutation creates new genetic variation in a gene pool. Fact 2: Genetic variation is the basis for natural selection. Given the two facts above, what is the basis for natural selection? | OPTIONS:
- animals
- Artificial construct
- stasis
- root growth
- mutation
- magic
- trees
- competition
A: mutation

Q: Fact 1: Most plants grow roots down into the soil to absorb water and minerals. Fact 2: Bamboos are vigorous, rugged plants. Given the two facts above, what grows roots down into the soil to absorb water and minerals? | OPTIONS:
- bamboo
- potatoes
- the Sun
- water
- ice
- Oak
- burrs
- Trees
A: bamboo