Problem:

Fact 1: Irradiating food can be used to kill existing microorganisms in the food.  Fact 2: Food irradiation is one tool for improving food safety by killing pathogenic microorganisms.  Given the two facts above, what does irradiating food do?
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A: improves food safety


Problem:

Fact 1: The color of leaves on deciduous trees usually changes in the autumn season.  Fact 2: Mulberry trees are deciduous.  Given the two facts above, what do mulberry trees do in the autumn?
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A: Change colors


Problem:

Fact 1: An electric stove transforms electrical energy to heat energy.  Fact 2: Electricity or electrical energy, is produced at a power plant.  Given the two facts above, what transforms electricity into heat?
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A: an electric stove


Problem:

Fact 1: Evolution is a change in the characteristics of living things over time.  Fact 2: On the other hand, the environment causes all living things to adapt.  Given the two facts above,  _can cause evolution?
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A: