Problem:OPTIONS:
- athletes
- Toys
- sharks
- Humans
- Video games
- exercise
- people
- A.I

Fact 1: Playing is just one of many ways that mammals and other animals learn how to behave. Fact 2: After all, seals are mammals just as humans are mammals. Given the two facts above, what uses playing as just one of many ways to learn how to behave?
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A: Humans

Problem:OPTIONS:
- streams.
- High winds
- streams
- rivers
- Fish
- Tourists
- Currents
- flooding

Fact 1: Asandbar is formed by water moving sediment downstream. Fact 2: Shoreline currents carrying sediments build sandbars and spits across bay mouths. Given the two facts above, what moves sediment downstream?
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A: Currents

Problem:OPTIONS:
- Bacteria
- animals
- the skin
- alveoli
- food
- Most plants
- PDAs
- lungs

Fact 1: Viruses often infect bacteria. Fact 2: Phages, or bacteriophages are viruses that infect bacteria. Given the two facts above, what do bacteriophages infect?
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A: Bacteria

Problem:OPTIONS:
- solutes
- death
- water
- Energy.
- energy
- matter
- low pHs
- Weight

Fact 1: If an animal sweats then that animal 's bodily water decreases. Fact 2: Many animals have developed ways of getting rid of extra heat by sweating or panting. Given the two facts above, many animals ways of getting rid of extra heat makes bodily what decrease?
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A:
water