Fact 1: Soil can be depleted of nutrients. Fact 2: Soil solids consist of mineral particles and organic matter. Given the two facts above, what can be depleted of nutrients?
OPTIONS:
- oceans
- swamp vegetation
- h2o
- By wind and rain
- mineral particles and organics
- clouds
- wind and erosion
- the environment

Answer: mineral particles and organics

Fact 1: Mutation creates new genetic variation in a gene pool. Fact 2: Fertilization increases genetic variation. Given the two facts above, the gene pool expands through fertilization and:?
OPTIONS:
- offspring
- agriculture
- mutation
- babies
- seeds
- zygotes
- relocation
- competition

Answer: mutation

Fact 1: Brain cells die quickly if their oxygen supply is cut off. Fact 2: Brain cells begin to die as soon as the heart stops pumping oxygen. Given the two facts above, what can cut off the oxygen to cells?
OPTIONS:
- Sulfur dioxide
- oxygen atoms
- the heart stopping
- massive damage
- smoking pipes
- water
- hair
- cigarettes

Answer:
the heart stopping