Problem:OPTIONS:
- liquid
- Metling snow
- freezing
- water
- Condensation
- burning
- melting
- heat

Fact 1: Freezing causes a solid to form. Fact 2: Ice, on the other hand, is a solid. Given the two facts above, what causes ice to form?
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A: freezing

Problem:OPTIONS:
- phytoplankton
- fungi
- refraction of light
- heat energy
- an organism's body
- carbon
- algae
- salt and water.

Fact 1: Zooplankton are tiny animals that feed on phytoplankton. Fact 2: Many zooplankton are crustaceans. Given the two facts above, some crustaceans feed on?
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A: phytoplankton

Problem:OPTIONS:
- adding heat
- humans
- fossil fuels
- A computer
- nerves
- people
- irradiation
- exercise

Fact 1: Playing is one way mammals and other animals learn how to behave. Fact 2: Exercise is fun if it is also play. Given the two facts above, what can teach animals how to behave?
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A: exercise

Problem:OPTIONS:
- Most plants
- infectious
- viruses
- bacteria
- Absorb light
- insects
- important habitats
- invertebrates

Fact 1: Animals are a kingdom of multicellular eukaryotes. Fact 2: Invertebrates are the majority of the animal kingdom. Given the two facts above, the majority of multicellular eukaryotes are:?
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A:
invertebrates