Problem:OPTIONS:
- critical organs
- body critics
- fur and fat
- protective bony armor
- redundant organs
- layers of fat
- sea urchins
- solar waves

Fact 1: Skin is used for protecting the body from harmful substances. Fact 2: Eyes and skin are the critical organs. Given the two facts above, what are used for protecting the body from harmful substances?
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A: critical organs

Problem:OPTIONS:
- humans
- viruses
- a fish
- animals
- bats
- frogs
- bacteria
- air

Fact 1: Most amphibians breathe with gills as larvae and with lungs as adults. Fact 2: All frogs are amphibians. Given the two facts above, what can breathe with gills as larvae and with lungs as adults?
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A: frogs

Problem:OPTIONS:
- an external framework
- electromagnetic energy
- rays or beams
- an object
- objects that have mass
- energy of moving objects
- our nearest star
- wavelengths and photons

Fact 1: When a hemisphere is tilted away from the sun , that hemisphere receives less direct sunlight. Fact 2: The Sun The Sun is our nearest star. Given the two facts above, what does the hemisphere have to be tilted away from to receive less sunlight?
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A: our nearest star

Problem:OPTIONS:
- emotion
- absence
- murmur
- energy
- waves
- arteries
- feelings
- voltage

Fact 1: Matter vibrating can cause sound. Fact 2: Music is sound, sound is energy. Given the two facts above, vibrating matter can cause music through what?
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A:
energy