Fact 1: All life relies on a relatively narrow range of pH, or acidity. Fact 2: Life during most of the Precambrian was restricted to bacteria and algae. Given the two facts above, bacteria relies on a relatively narrow range of what?

OPTIONS:
- RNA
- Fe
- 12
- DDT
- DNA
- pH
- CO2
- O2

Answer: pH

Fact 1: The moon revolving around the Earth causes the phases of the moon. Fact 2: Phases of the Moon are caused by differing amounts of light reflected from the Earth. Given the two facts above, what causes differing light to reflect off of the moon?

OPTIONS:
- depress neuronal excitability
- energy of moving objects
- The revolution around earth
- our nearest star
- a hemisphere is tilted away from the sun
- focusing a lens
- flow of electrons
- that material's properties

Answer: The revolution around earth

Fact 1: If something is outside during the day then that something will receive sunlight. Fact 2: Exposure to excessive sunlight can cause skin rashes or skin burns. Given the two facts above, something where during the day may receive skin rashes or burns?

OPTIONS:
- in the dark
- an object
- humans
- in a closet
- outside
- in a hole
- sun's heat
- dormant

Answer: outside

Fact 1: Extreme heat and pressure change rock into metamorphic rock. Fact 2: Sedimentary rock changes into a different form when it undergoes heat, pressure or other forces. Given the two facts above, what makes sedimentary rock turn into metamorphic?

OPTIONS:
- crust
- erosion
- thrust
- wind
- two
- coal
- calcite
- Force

Answer:
Force