Fact 1: Hair is a fiber that is found only in mammals. Fact 2: Hair is largely made of keratin, a protein that contains a lot of the amino acid cystine . Given the two facts above, what do mammals contain?

OPTIONS:
- food
- ghosts
- keratin
- Animal fur
- magic
- soul
- alveoli
- four limbs

Answer: keratin

Fact 1: Contact between rocks over long periods of time causes rocks to smooth. Fact 2: Smoothed, grooved and polished rocks are produced by glacial erosion. Given the two facts above, what is erosion?

OPTIONS:
- moonlight
- looseness of dirt or compost
- permineralization
- water vapor
- fog
- The area was once underwater
- fissures of hot, acidic water
- contact between rocks

Answer: contact between rocks

Fact 1: Using a car causes pollution. Fact 2: Pollution is a damaging excess of contaminants. Given the two facts above, how do cars damage the environment?

OPTIONS:
- Battery useage
- exposure to the sun
- Emitting an excess of contaminants
- they travel great distances
- Using too much gas
- Causing accidents
- depress neuronal excitability
- within and around

Answer: Emitting an excess of contaminants

Fact 1: Phase changes do not change mass. Fact 2: Particles have mass, but mass is energy. Given the two facts above, what property of matter is not changed during a phase change?

OPTIONS:
- motility
- sweating
- energy
- cold
- nucleus
- density
- apoptosis
- an object

Answer:
energy