Problem:OPTIONS:
- An infection
- amoebae
- heating liquids
- An antibiotic
- smoking
- Vitamins
- prolactin release
- Food poisoning

Fact 1: Infection can cause bodily tissues to swell. Fact 2: Doctors call such tissue swelling edema. Given the two facts above, what causes edema?
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A: An infection

Problem:OPTIONS:
- preventing heat transfer
- dragons
- passenger pigeons
- butterflies
- animals in the class Aves
- airplanes
- it protects them
- retaining heat

Fact 1: Feathers help birds fly and provide insulation. Fact 2: Class Aves is for the birds, literally. Given the two facts above, feathers help what kind of animals fly and provide insulation?
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A: animals in the class Aves

Problem:OPTIONS:
- white
- Rocks
- crust
- nitrogen
- gas
- water
- heat
- solid

Fact 1: Melting is when solids are heated above their melting point. Fact 2: Solid ice is melted into liquid water. Given the two facts above, what does ice change into above it's melting point?
****
A: water

Problem:OPTIONS:
- bamboo
- desiccation
- burrs
- elms
- moss
- coal
- candy
- meat

Fact 1: Being burried under soil and mud changes vegetation into peat through extreme heat and pressure in a swamp over a long period of time. Fact 2: After a long time, the moss can form into a peat. Given the two facts above, what forms into peat through extreme heat and pressure over time?
****
A:
moss