Problem:OPTIONS:
- plants
- organs
- brain cells
- athletes
- humans
- species
- critical organs
- mushrooms

Fact 1: Brain cells die quickly if their oxygen supply is cut off. Fact 2: Here, the lungs supply the blood with oxygen. Given the two facts above, what will die without a supply of blood?
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A: brain cells

Problem:OPTIONS:
- flowers
- bushes
- Trees
- organisms
- Oak
- insulator
- Conifers
- grass

Fact 1: Plants use cellulose for their cell walls. Fact 2: All plants are of bush type. Given the two facts above, what uses cellulose for their cell walls?
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A: bushes

Problem:OPTIONS:
- rainfall
- hyperthyroidism
- heating liquids
- mechanical
- chemical changes
- sinking air
- fossil fuels
- our nearest star

Fact 1: High pressure systems cause clear weather. Fact 2: Clear weather is caused by sinking air. Given the two facts above, what causes high pressure systems?
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A: sinking air

Problem:OPTIONS:
- insects
- plants
- humans
- some mammals
- oxygen
- elephants
- monotremes
- Frogs

Fact 1: Lungs are used for breathing air by land animals. Fact 2: Elephants are the largest land animals. Given the two facts above, what uses lungs to breathe air?
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A:
elephants