Problem:OPTIONS:
- The bending of a ray of light
- recovery time from fatigue
- decreasing nutrients
- Dehydration
- decreasing flavor
- fading color
- bacteria from growing
- direct damage to the lungs

Fact 1: Keeping food cold is used for keeping food fresh. Fact 2: Sulfites keep foods fresh-looking (e.g., fruits, vegetables) and help prevent bacteria from growing. Given the two facts above, keeping food cold prevents?
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A: bacteria from growing

Problem:OPTIONS:
- animals
- mammals
- humans
- plants
- goats
- offspring
- Species
- alleles

Fact 1: Gene flow occurs when individuals move into or out of a population. Fact 2: Populations Populations are subsets of a species. Given the two facts above, gene flow occurs when individuals move into or out of a subset of a what?
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A: Species

Problem:OPTIONS:
- time
- Organic molecules
- money
- fur and fat
- chlorofluorocarbons
- love
- Chemical energy
- wavelengths and photons

Fact 1: Heterotrophs are living things that cannot make their own food. Fact 2: Heterotrophs get organic molecules from other organisms. Given the two facts above, what does food contain?
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A: Organic molecules

Problem:OPTIONS:
- chemical reaction
- egg formation
- shell crack
- They may not survive.
- chemical ending
- Chemical energy
- Evaporation
- looseness

Fact 1: Heating an egg causes a chemical reaction in the egg. Fact 2: While pasta is cooking, warm the oil over medium heat in a large skillet. Given the two facts above, warming in a skillet causes a what in an egg?
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A:
chemical reaction